Commits · 0c62c93a097fbe72161dd354ea6f4026d8e33580 · go / golang

28 Apr, 2015 23 commits

runtime/cgo: use PTHREAD_{MUTEX,COND}_INITIALIZER · 0c62c93a

Ian Lance Taylor authored Apr 28, 2015

Technically you must initialize static pthread_mutex_t and
pthread_cond_t variables with the appropriate INITIALIZER macro.  In
practice the default initializers are zero anyhow, but it's still good
code hygiene.

Change-Id: I517304b16c2c7943b3880855c1b47a9a506b4bdf
Reviewed-on: https://go-review.googlesource.com/9433Reviewed-by: David Crawshaw <crawshaw@golang.org>

0c62c93a

net/http: documentation updates · 339cf980

Brad Fitzpatrick authored Apr 28, 2015

Fixes #10366 (how to set custom headers)
Fixes #9836 (PATCH in PostForm)
Fixes #9276 (generating a server-side Request for testing)
Update #8991 (clarify Response.Write for now; export ReverseProxy's copy later?)

Change-Id: I95a11bf3bb3eeeeb72775b6ebfbc761641addc35
Reviewed-on: https://go-review.googlesource.com/9410Reviewed-by: David Crawshaw <crawshaw@golang.org>

339cf980

doc/go1.5.txt: snow leopard not maintained · ac354ba7

Rob Pike authored Apr 28, 2015

Change-Id: If50fd2dd4005d0ce39081c6b8302707403c139f9
Reviewed-on: https://go-review.googlesource.com/9432Reviewed-by: Rob Pike <r@golang.org>

ac354ba7

net/http: test and document suppressing implicit Content-Type response header · 5ed44e9d

Brad Fitzpatrick authored Apr 28, 2015

No code changes.

Fixes #8992

Change-Id: I10c8340a4f8e3e7add9b3ac5aa0a1e8d8aa49f40
Reviewed-on: https://go-review.googlesource.com/9412Reviewed-by: David Crawshaw <crawshaw@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>

5ed44e9d

cmd/doc: print documentation for all matches in a package, not just the first · d3bd6b6a

Rob Pike authored Apr 28, 2015

Change-Id: Id0d4ac7169f741dfeec7b1e67bdc21e49ae37b9e
Reviewed-on: https://go-review.googlesource.com/9430Reviewed-by: Russ Cox <rsc@golang.org>

d3bd6b6a

cmd/asm: add comments back for aliases on jumps for x86 · a88994c1

Rob Pike authored Apr 28, 2015

These were lost in the transition from 8a/6a to asm.
Also, in the process, discover more aliases. I'm betting the missing
ones were a casualty of the recent merge of 386 and amd64.

Update #10385.

Change-Id: I1681034b25af3ffc103f75e5fc57baca5feb3fcd
Reviewed-on: https://go-review.googlesource.com/9431Reviewed-by: Russ Cox <rsc@golang.org>

a88994c1

doc: mention several recent crypto changes in go1.5.txt · d2d840aa

Adam Langley authored Apr 28, 2015

Change-Id: Icf212fc7ea108ff22bb7fa9da137410d729d2569
Reviewed-on: https://go-review.googlesource.com/9413Reviewed-by: Adam Langley <agl@golang.org>

d2d840aa

encoding/asn1: Improved control of flags and times · 0bb96bea

Richard Barnes authored Feb 12, 2015

This change corrects the serialization of asn1.Flag values, so that
when set, they serialize to an empty value, and when unset, they are
omitted. It also adds a format parameter that allows calling code
to control whether time.Time values are serialized as UTCTime or
GeneralizedTime.

Change-Id: I6d97abf009ea317338dab30c80f35a2de7e07104
Reviewed-on: https://go-review.googlesource.com/5970Reviewed-by: Adam Langley <agl@golang.org>
Run-TryBot: Adam Langley <agl@golang.org>

0bb96bea

crypto/x509: allow parsing of certificates with unknown critical extensions. · d942737f

Adam Langley authored Apr 26, 2015

Previously, unknown critical extensions were a parse error. However, for
some cases one wishes to parse and use a certificate that may contain
these extensions. For example, when using a certificate in a TLS server:
it's the client's concern whether it understands the critical extensions
but the server still wishes to parse SNI values out of the certificate
etc.

This change moves the rejection of unknown critical extensions from
ParseCertificate to Certificate.Verify. The former will now record the
OIDs of unknown critical extensions in the Certificate and the latter
will fail to verify certificates with them. If a user of this package
wishes to handle any unknown critical extensions themselves, they can
extract the extensions from Certificate.Extensions, process them and
remove known OIDs from Certificate.UnknownCriticalExtensions.

See discussion at
https://groups.google.com/forum/#!msg/golang-nuts/IrzoZlwalTQ/qdK1k-ogeHIJ
and in the linked bug.

Fixes #10459

Change-Id: I762521a44c01160fa0901f990ba2f5d4977d7977
Reviewed-on: https://go-review.googlesource.com/9390Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

d942737f

runtime: eliminate one heapBitsForObject from scanobject · 63caec5d

Austin Clements authored Apr 26, 2015

scanobject with ptrmask!=nil is only ever called with the base
pointer of a heap object. Currently, scanobject calls
heapBitsForObject, which goes to a great deal of trouble to check
that the pointer points into the heap and to find the base of the
object it points to, both of which are completely unnecessary in
this case.

Replace this call to heapBitsForObject with much simpler logic to
fetch the span and compute the heap bits.

Benchmark results with five runs:

name old mean new mean delta
BenchmarkBinaryTree17 9.21s × (0.95,1.02) 8.55s × (0.91,1.03) -7.16% (p=0.022)
BenchmarkFannkuch11 2.65s × (1.00,1.00) 2.62s × (1.00,1.00) -1.10% (p=0.000)
BenchmarkFmtFprintfEmpty 73.2ns × (0.99,1.01) 71.7ns × (1.00,1.01) -1.99% (p=0.004)
BenchmarkFmtFprintfString 302ns × (0.99,1.00) 292ns × (0.98,1.02) -3.31% (p=0.020)
BenchmarkFmtFprintfInt 281ns × (0.98,1.01) 279ns × (0.96,1.02) ~ (p=0.596)
BenchmarkFmtFprintfIntInt 482ns × (0.98,1.01) 488ns × (0.95,1.02) ~ (p=0.419)
BenchmarkFmtFprintfPrefixedInt 382ns × (0.99,1.01) 365ns × (0.96,1.02) -4.35% (p=0.015)
BenchmarkFmtFprintfFloat 475ns × (0.99,1.01) 472ns × (1.00,1.00) ~ (p=0.108)
BenchmarkFmtManyArgs 1.89µs × (1.00,1.01) 1.90µs × (0.94,1.02) ~ (p=0.883)
BenchmarkGobDecode 22.4ms × (0.99,1.01) 21.9ms × (0.92,1.04) ~ (p=0.332)
BenchmarkGobEncode 24.7ms × (0.98,1.02) 23.9ms × (0.87,1.07) ~ (p=0.407)
BenchmarkGzip 397ms × (0.99,1.01) 398ms × (0.99,1.01) ~ (p=0.718)
BenchmarkGunzip 96.7ms × (1.00,1.00) 96.9ms × (1.00,1.00) ~ (p=0.230)
BenchmarkHTTPClientServer 71.5µs × (0.98,1.01) 68.5µs × (0.92,1.06) ~ (p=0.243)
BenchmarkJSONEncode 46.1ms × (0.98,1.01) 44.9ms × (0.98,1.03) -2.51% (p=0.040)
BenchmarkJSONDecode 86.1ms × (0.99,1.01) 86.5ms × (0.99,1.01) ~ (p=0.343)
BenchmarkMandelbrot200 4.12ms × (1.00,1.00) 4.13ms × (1.00,1.00) +0.23% (p=0.000)
BenchmarkGoParse 5.89ms × (0.96,1.03) 5.82ms × (0.96,1.04) ~ (p=0.522)
BenchmarkRegexpMatchEasy0_32 141ns × (0.99,1.01) 142ns × (1.00,1.00) ~ (p=0.178)
BenchmarkRegexpMatchEasy0_1K 408ns × (1.00,1.00) 392ns × (0.99,1.00) -3.83% (p=0.000)
BenchmarkRegexpMatchEasy1_32 122ns × (1.00,1.00) 122ns × (1.00,1.00) ~ (p=0.178)
BenchmarkRegexpMatchEasy1_1K 626ns × (1.00,1.01) 624ns × (0.99,1.00) ~ (p=0.122)
BenchmarkRegexpMatchMedium_32 202ns × (0.99,1.00) 205ns × (0.99,1.01) +1.58% (p=0.001)
BenchmarkRegexpMatchMedium_1K 54.4µs × (1.00,1.00) 55.5µs × (1.00,1.00) +1.86% (p=0.000)
BenchmarkRegexpMatchHard_32 2.68µs × (1.00,1.00) 2.71µs × (1.00,1.00) +0.97% (p=0.002)
BenchmarkRegexpMatchHard_1K 79.8µs × (1.00,1.01) 80.5µs × (1.00,1.01) +0.94% (p=0.003)
BenchmarkRevcomp 590ms × (0.99,1.01) 585ms × (1.00,1.00) ~ (p=0.066)
BenchmarkTemplate 111ms × (0.97,1.02) 112ms × (0.99,1.01) ~ (p=0.201)
BenchmarkTimeParse 392ns × (1.00,1.00) 385ns × (1.00,1.00) -1.69% (p=0.000)
BenchmarkTimeFormat 449ns × (0.98,1.01) 448ns × (0.99,1.01) ~ (p=0.550)

Change-Id: Ie7c3830c481d96c9043e7bf26853c6c1d05dc9f4
Reviewed-on: https://go-review.googlesource.com/9364Reviewed-by: Rick Hudson <rlh@golang.org>

63caec5d

cmd/internal/ld: remove Biobuf unget · 05d53165

David Crawshaw authored Apr 27, 2015

The underlying *bufio.Reader does everything that's needed here.

Change-Id: If0712a5b4d3142ae4bceaa2efe287eaf2b91e54e
Reviewed-on: https://go-review.googlesource.com/9365Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

05d53165

doc/go1.5.txt: mention goroutine scheduling change · cbbe9f63

Russ Cox authored Apr 27, 2015

Change-Id: I43a40f0c10472b3126c06b0d4268b32b54665f12
Reviewed-on: https://go-review.googlesource.com/9349Reviewed-by: Rob Pike <r@golang.org>

cbbe9f63

Revert "Revert "cmd/dist: consolidate runtime CPU tests"" · 45ccea71

Josh Bleecher Snyder authored Apr 27, 2015

This reverts commit 81c2233b.

Change-Id: Ie7024f04dba6352ae79ba68d4da5c0c25844cd8c
Reviewed-on: https://go-review.googlesource.com/9397Reviewed-by: Dave Cheney <dave@cheney.net>
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

45ccea71

cmd/internal/gc: emit typedmemmove write barrier from sgen · 2a735590

Russ Cox authored Apr 17, 2015

Emitting it here instead of rewriting the tree earlier sets us up
to generate an inline check, like we do for single pointers.
But even without the inline check, generating at this level lets
us generate significantly more efficient code, probably due to
having fewer temporaries and less complex high-level code
for the compiler to churn through.

Revcomp is worse, almost certainly due to register pressure.

name old new delta
BenchmarkBinaryTree17 18.0s × (0.99,1.01) 18.0s × (0.99,1.01) ~
BenchmarkFannkuch11 4.43s × (1.00,1.00) 4.36s × (1.00,1.00) -1.44%
BenchmarkFmtFprintfEmpty 114ns × (0.95,1.05) 86ns × (0.97,1.06) -24.12%
BenchmarkFmtFprintfString 468ns × (0.99,1.01) 420ns × (0.99,1.02) -10.16%
BenchmarkFmtFprintfInt 433ns × (1.00,1.01) 386ns × (0.99,1.02) -10.74%
BenchmarkFmtFprintfIntInt 748ns × (0.99,1.01) 647ns × (0.99,1.01) -13.56%
BenchmarkFmtFprintfPrefixedInt 547ns × (0.99,1.01) 499ns × (0.99,1.02) -8.78%
BenchmarkFmtFprintfFloat 756ns × (1.00,1.01) 689ns × (1.00,1.00) -8.86%
BenchmarkFmtManyArgs 2.79µs × (1.00,1.01) 2.53µs × (1.00,1.00) -9.30%
BenchmarkGobDecode 39.6ms × (0.99,1.00) 39.2ms × (0.98,1.01) -1.07%
BenchmarkGobEncode 37.6ms × (1.00,1.01) 37.5ms × (0.99,1.01) ~
BenchmarkGzip 663ms × (0.99,1.02) 660ms × (0.98,1.01) ~
BenchmarkGunzip 142ms × (1.00,1.00) 143ms × (1.00,1.00) ~
BenchmarkHTTPClientServer 132µs × (0.99,1.01) 133µs × (0.99,1.02) ~
BenchmarkJSONEncode 56.2ms × (0.99,1.01) 54.0ms × (0.98,1.01) -3.97%
BenchmarkJSONDecode 138ms × (1.00,1.00) 134ms × (0.99,1.02) -2.70%
BenchmarkMandelbrot200 6.03ms × (1.00,1.01) 6.00ms × (1.00,1.01) ~
BenchmarkGoParse 9.82ms × (0.93,1.10) 10.35ms × (0.88,1.11) ~
BenchmarkRegexpMatchEasy0_32 207ns × (1.00,1.00) 163ns × (0.99,1.01) -21.26%
BenchmarkRegexpMatchEasy0_1K 581ns × (1.00,1.01) 566ns × (0.99,1.00) -2.50%
BenchmarkRegexpMatchEasy1_32 185ns × (0.99,1.01) 138ns × (1.00,1.01) -25.41%
BenchmarkRegexpMatchEasy1_1K 975ns × (1.00,1.01) 892ns × (1.00,1.00) -8.51%
BenchmarkRegexpMatchMedium_32 328ns × (0.99,1.00) 252ns × (1.00,1.00) -23.17%
BenchmarkRegexpMatchMedium_1K 88.6µs × (1.00,1.01) 73.0µs × (1.00,1.01) -17.66%
BenchmarkRegexpMatchHard_32 4.69µs × (0.95,1.03) 3.85µs × (1.00,1.01) -17.91%
BenchmarkRegexpMatchHard_1K 133µs × (1.00,1.01) 117µs × (1.00,1.00) -12.34%
BenchmarkRevcomp 902ms × (0.99,1.05) 1001ms × (0.94,1.01) +11.04%
BenchmarkTemplate 174ms × (0.99,1.01) 160ms × (0.99,1.01) -7.70%
BenchmarkTimeParse 639ns × (1.00,1.00) 622ns × (1.00,1.00) -2.66%
BenchmarkTimeFormat 736ns × (1.00,1.01) 736ns × (1.00,1.02) ~

Change-Id: Ib3bbeb379f5f4819e6f5dcf69bc88a2b7ed41460
Reviewed-on: https://go-review.googlesource.com/9225Reviewed-by: Austin Clements <austin@google.com>
Run-TryBot: Russ Cox <rsc@golang.org>

2a735590

cmd/internal/gc: inline writeBarrierEnabled check before calling writebarrierptr · 653d5607

Russ Cox authored Apr 24, 2015

I believe the benchmarks that get slower are under register pressure,
and not making the call unconditionally makes the pressure worse,
and the register allocator doesn't do a great job. But part of the point
of this sequence is to get the write barriers out of the way so I can work
on the register allocator, so that's okay.

name old new delta
BenchmarkBinaryTree17 17.9s × (1.00,1.01) 18.0s × (0.99,1.01) ~
BenchmarkFannkuch11 4.43s × (1.00,1.00) 4.43s × (1.00,1.00) ~
BenchmarkFmtFprintfEmpty 110ns × (1.00,1.06) 114ns × (0.95,1.05) ~
BenchmarkFmtFprintfString 487ns × (0.99,1.00) 468ns × (0.99,1.01) -4.00%
BenchmarkFmtFprintfInt 450ns × (0.99,1.00) 433ns × (1.00,1.01) -3.88%
BenchmarkFmtFprintfIntInt 762ns × (1.00,1.00) 748ns × (0.99,1.01) -1.84%
BenchmarkFmtFprintfPrefixedInt 584ns × (0.99,1.01) 547ns × (0.99,1.01) -6.26%
BenchmarkFmtFprintfFloat 738ns × (1.00,1.00) 756ns × (1.00,1.01) +2.37%
BenchmarkFmtManyArgs 2.80µs × (1.00,1.01) 2.79µs × (1.00,1.01) ~
BenchmarkGobDecode 39.0ms × (0.99,1.00) 39.6ms × (0.99,1.00) +1.54%
BenchmarkGobEncode 37.8ms × (0.98,1.01) 37.6ms × (1.00,1.01) ~
BenchmarkGzip 661ms × (0.99,1.01) 663ms × (0.99,1.02) ~
BenchmarkGunzip 142ms × (1.00,1.00) 142ms × (1.00,1.00) ~
BenchmarkHTTPClientServer 132µs × (0.99,1.01) 132µs × (0.99,1.01) ~
BenchmarkJSONEncode 56.3ms × (0.99,1.01) 56.2ms × (0.99,1.01) ~
BenchmarkJSONDecode 138ms × (0.99,1.01) 138ms × (1.00,1.00) ~
BenchmarkMandelbrot200 6.01ms × (1.00,1.00) 6.03ms × (1.00,1.01) +0.23%
BenchmarkGoParse 10.2ms × (0.87,1.05) 9.8ms × (0.93,1.10) ~
BenchmarkRegexpMatchEasy0_32 208ns × (1.00,1.00) 207ns × (1.00,1.00) ~
BenchmarkRegexpMatchEasy0_1K 588ns × (1.00,1.00) 581ns × (1.00,1.01) -1.27%
BenchmarkRegexpMatchEasy1_32 182ns × (0.99,1.01) 185ns × (0.99,1.01) +1.65%
BenchmarkRegexpMatchEasy1_1K 986ns × (1.00,1.01) 975ns × (1.00,1.01) -1.17%
BenchmarkRegexpMatchMedium_32 323ns × (1.00,1.01) 328ns × (0.99,1.00) +1.55%
BenchmarkRegexpMatchMedium_1K 89.9µs × (1.00,1.00) 88.6µs × (1.00,1.01) -1.38%
BenchmarkRegexpMatchHard_32 4.72µs × (0.95,1.01) 4.69µs × (0.95,1.03) ~
BenchmarkRegexpMatchHard_1K 133µs × (1.00,1.01) 133µs × (1.00,1.01) ~
BenchmarkRevcomp 900ms × (1.00,1.05) 902ms × (0.99,1.05) ~
BenchmarkTemplate 168ms × (0.99,1.01) 174ms × (0.99,1.01) +3.30%
BenchmarkTimeParse 637ns × (1.00,1.00) 639ns × (1.00,1.00) +0.31%
BenchmarkTimeFormat 738ns × (1.00,1.00) 736ns × (1.00,1.01) ~

Change-Id: I03ce152852edec404538f6c20eb650fac82e2aa2
Reviewed-on: https://go-review.googlesource.com/9224Reviewed-by: Austin Clements <austin@google.com>

653d5607

runtime: replace needwb() with writeBarrierEnabled · 32d6fbcb

Russ Cox authored Apr 24, 2015

Reduce the write barrier check to a single load and compare
so that it can be inlined into write barrier use sites.
Makes the standard write barrier a little faster too.

name old new delta
BenchmarkBinaryTree17 17.9s × (0.99,1.01) 17.9s × (1.00,1.01) ~
BenchmarkFannkuch11 4.35s × (1.00,1.00) 4.43s × (1.00,1.00) +1.81%
BenchmarkFmtFprintfEmpty 120ns × (0.93,1.06) 110ns × (1.00,1.06) -7.92%
BenchmarkFmtFprintfString 479ns × (0.99,1.00) 487ns × (0.99,1.00) +1.67%
BenchmarkFmtFprintfInt 452ns × (0.99,1.02) 450ns × (0.99,1.00) ~
BenchmarkFmtFprintfIntInt 766ns × (0.99,1.01) 762ns × (1.00,1.00) ~
BenchmarkFmtFprintfPrefixedInt 576ns × (0.98,1.01) 584ns × (0.99,1.01) ~
BenchmarkFmtFprintfFloat 730ns × (1.00,1.01) 738ns × (1.00,1.00) +1.16%
BenchmarkFmtManyArgs 2.84µs × (0.99,1.00) 2.80µs × (1.00,1.01) -1.22%
BenchmarkGobDecode 39.3ms × (0.98,1.01) 39.0ms × (0.99,1.00) ~
BenchmarkGobEncode 39.5ms × (0.99,1.01) 37.8ms × (0.98,1.01) -4.33%
BenchmarkGzip 663ms × (1.00,1.01) 661ms × (0.99,1.01) ~
BenchmarkGunzip 143ms × (1.00,1.00) 142ms × (1.00,1.00) ~
BenchmarkHTTPClientServer 132µs × (0.99,1.01) 132µs × (0.99,1.01) ~
BenchmarkJSONEncode 57.4ms × (0.99,1.01) 56.3ms × (0.99,1.01) -1.96%
BenchmarkJSONDecode 139ms × (0.99,1.00) 138ms × (0.99,1.01) ~
BenchmarkMandelbrot200 6.03ms × (1.00,1.00) 6.01ms × (1.00,1.00) ~
BenchmarkGoParse 10.3ms × (0.89,1.14) 10.2ms × (0.87,1.05) ~
BenchmarkRegexpMatchEasy0_32 209ns × (1.00,1.00) 208ns × (1.00,1.00) ~
BenchmarkRegexpMatchEasy0_1K 591ns × (0.99,1.00) 588ns × (1.00,1.00) ~
BenchmarkRegexpMatchEasy1_32 184ns × (0.99,1.02) 182ns × (0.99,1.01) ~
BenchmarkRegexpMatchEasy1_1K 1.01µs × (1.00,1.00) 0.99µs × (1.00,1.01) -2.33%
BenchmarkRegexpMatchMedium_32 330ns × (1.00,1.00) 323ns × (1.00,1.01) -2.12%
BenchmarkRegexpMatchMedium_1K 92.6µs × (1.00,1.00) 89.9µs × (1.00,1.00) -2.92%
BenchmarkRegexpMatchHard_32 4.80µs × (0.95,1.00) 4.72µs × (0.95,1.01) ~
BenchmarkRegexpMatchHard_1K 136µs × (1.00,1.00) 133µs × (1.00,1.01) -1.86%
BenchmarkRevcomp 900ms × (0.99,1.04) 900ms × (1.00,1.05) ~
BenchmarkTemplate 172ms × (1.00,1.00) 168ms × (0.99,1.01) -2.07%
BenchmarkTimeParse 637ns × (1.00,1.00) 637ns × (1.00,1.00) ~
BenchmarkTimeFormat 744ns × (1.00,1.01) 738ns × (1.00,1.00) -0.67%

Change-Id: I4ecc925805da1f5ee264377f1f7574f54ee575e7
Reviewed-on: https://go-review.googlesource.com/9321Reviewed-by: Austin Clements <austin@google.com>

32d6fbcb

runtime: change unused argument in fat write barriers from pointer to scalar · 2050f571

Russ Cox authored Apr 24, 2015

The argument is unused, only present for alignment of the
following argument. The compiler today always passes a zero
but I'd rather not write anything there during the call sequence,
so mark it as a scalar so the garbage collector won't look at it.

As expected, no significant performance change.

name old new delta
BenchmarkBinaryTree17 17.9s × (0.99,1.00) 17.9s × (0.99,1.01) ~
BenchmarkFannkuch11 4.35s × (1.00,1.00) 4.35s × (1.00,1.00) ~
BenchmarkFmtFprintfEmpty 120ns × (0.94,1.05) 120ns × (0.93,1.06) ~
BenchmarkFmtFprintfString 477ns × (1.00,1.00) 479ns × (0.99,1.00) ~
BenchmarkFmtFprintfInt 450ns × (0.99,1.01) 452ns × (0.99,1.02) ~
BenchmarkFmtFprintfIntInt 765ns × (0.99,1.01) 766ns × (0.99,1.01) ~
BenchmarkFmtFprintfPrefixedInt 569ns × (0.99,1.01) 576ns × (0.98,1.01) ~
BenchmarkFmtFprintfFloat 728ns × (1.00,1.00) 730ns × (1.00,1.01) ~
BenchmarkFmtManyArgs 2.82µs × (0.99,1.01) 2.84µs × (0.99,1.00) ~
BenchmarkGobDecode 39.1ms × (0.99,1.01) 39.3ms × (0.98,1.01) ~
BenchmarkGobEncode 39.4ms × (0.99,1.01) 39.5ms × (0.99,1.01) ~
BenchmarkGzip 661ms × (0.99,1.01) 663ms × (1.00,1.01) ~
BenchmarkGunzip 143ms × (1.00,1.00) 143ms × (1.00,1.00) ~
BenchmarkHTTPClientServer 133µs × (0.99,1.01) 132µs × (0.99,1.01) ~
BenchmarkJSONEncode 57.3ms × (0.99,1.04) 57.4ms × (0.99,1.01) ~
BenchmarkJSONDecode 139ms × (0.99,1.00) 139ms × (0.99,1.00) ~
BenchmarkMandelbrot200 6.02ms × (1.00,1.00) 6.03ms × (1.00,1.00) ~
BenchmarkGoParse 9.72ms × (0.92,1.11) 10.31ms × (0.89,1.14) ~
BenchmarkRegexpMatchEasy0_32 209ns × (1.00,1.01) 209ns × (1.00,1.00) ~
BenchmarkRegexpMatchEasy0_1K 592ns × (0.99,1.00) 591ns × (0.99,1.00) ~
BenchmarkRegexpMatchEasy1_32 183ns × (0.98,1.01) 184ns × (0.99,1.02) ~
BenchmarkRegexpMatchEasy1_1K 1.01µs × (1.00,1.01) 1.01µs × (1.00,1.00) ~
BenchmarkRegexpMatchMedium_32 330ns × (1.00,1.00) 330ns × (1.00,1.00) ~
BenchmarkRegexpMatchMedium_1K 92.4µs × (1.00,1.00) 92.6µs × (1.00,1.00) ~
BenchmarkRegexpMatchHard_32 4.77µs × (0.95,1.01) 4.80µs × (0.95,1.00) ~
BenchmarkRegexpMatchHard_1K 136µs × (1.00,1.00) 136µs × (1.00,1.00) ~
BenchmarkRevcomp 906ms × (0.99,1.05) 900ms × (0.99,1.04) ~
BenchmarkTemplate 171ms × (0.99,1.01) 172ms × (1.00,1.00) ~
BenchmarkTimeParse 638ns × (1.00,1.00) 637ns × (1.00,1.00) ~
BenchmarkTimeFormat 745ns × (0.99,1.02) 744ns × (1.00,1.01) ~

Change-Id: I0aeac5dc7adfd75e2223e3aabfedc7818d339f9b
Reviewed-on: https://go-review.googlesource.com/9320Reviewed-by: Austin Clements <austin@google.com>

2050f571

cmd/internal/gc: accept comma-separated list of name=value for -d · 6c328efc

Russ Cox authored Apr 24, 2015

This should obviously have no performance impact.
Listing numbers just as a sanity check for the benchmark
comparison program: it should (and does) find nothing
to report.

name old new delta
BenchmarkBinaryTree17 18.0s × (0.99,1.01) 17.9s × (0.99,1.00) ~
BenchmarkFannkuch11 4.36s × (1.00,1.00) 4.35s × (1.00,1.00) ~
BenchmarkFmtFprintfEmpty 120ns × (0.99,1.06) 120ns × (0.94,1.05) ~
BenchmarkFmtFprintfString 480ns × (0.99,1.01) 477ns × (1.00,1.00) ~
BenchmarkFmtFprintfInt 451ns × (0.99,1.01) 450ns × (0.99,1.01) ~
BenchmarkFmtFprintfIntInt 766ns × (0.99,1.01) 765ns × (0.99,1.01) ~
BenchmarkFmtFprintfPrefixedInt 569ns × (0.99,1.01) 569ns × (0.99,1.01) ~
BenchmarkFmtFprintfFloat 728ns × (1.00,1.01) 728ns × (1.00,1.00) ~
BenchmarkFmtManyArgs 2.81µs × (1.00,1.01) 2.82µs × (0.99,1.01) ~
BenchmarkGobDecode 39.4ms × (0.99,1.01) 39.1ms × (0.99,1.01) ~
BenchmarkGobEncode 39.4ms × (0.99,1.00) 39.4ms × (0.99,1.01) ~
BenchmarkGzip 660ms × (1.00,1.01) 661ms × (0.99,1.01) ~
BenchmarkGunzip 143ms × (1.00,1.00) 143ms × (1.00,1.00) ~
BenchmarkHTTPClientServer 132µs × (0.99,1.01) 133µs × (0.99,1.01) ~
BenchmarkJSONEncode 57.1ms × (0.99,1.01) 57.3ms × (0.99,1.04) ~
BenchmarkJSONDecode 138ms × (1.00,1.01) 139ms × (0.99,1.00) ~
BenchmarkMandelbrot200 6.02ms × (1.00,1.00) 6.02ms × (1.00,1.00) ~
BenchmarkGoParse 9.79ms × (0.92,1.07) 9.72ms × (0.92,1.11) ~
BenchmarkRegexpMatchEasy0_32 210ns × (1.00,1.01) 209ns × (1.00,1.01) ~
BenchmarkRegexpMatchEasy0_1K 593ns × (0.99,1.01) 592ns × (0.99,1.00) ~
BenchmarkRegexpMatchEasy1_32 182ns × (0.99,1.01) 183ns × (0.98,1.01) ~
BenchmarkRegexpMatchEasy1_1K 1.01µs × (1.00,1.01) 1.01µs × (1.00,1.01) ~
BenchmarkRegexpMatchMedium_32 331ns × (1.00,1.00) 330ns × (1.00,1.00) ~
BenchmarkRegexpMatchMedium_1K 92.6µs × (1.00,1.01) 92.4µs × (1.00,1.00) ~
BenchmarkRegexpMatchHard_32 4.58µs × (0.99,1.05) 4.77µs × (0.95,1.01) ~
BenchmarkRegexpMatchHard_1K 136µs × (1.00,1.01) 136µs × (1.00,1.00) ~
BenchmarkRevcomp 900ms × (0.99,1.06) 906ms × (0.99,1.05) ~
BenchmarkTemplate 171ms × (1.00,1.01) 171ms × (0.99,1.01) ~
BenchmarkTimeParse 637ns × (1.00,1.00) 638ns × (1.00,1.00) ~
BenchmarkTimeFormat 742ns × (1.00,1.00) 745ns × (0.99,1.02) ~

Change-Id: I59ec875715cb176bbffa709546370a6a7fc5a75d
Reviewed-on: https://go-review.googlesource.com/9309Reviewed-by: Austin Clements <austin@google.com>

6c328efc

cmd/internal/gc: use MOV R0, R1 instead of LEA 0(R0), R1 in Agen · 0f0bc0f0

Russ Cox authored Apr 24, 2015

Minor code generation optimization I've been meaning to do
for a while and noticed while working on the emitted write
barrier code. Using MOV lets the compiler and maybe the
processor do copy propagation.

name old new delta
BenchmarkBinaryTree17 17.9s × (0.99,1.01) 18.0s × (0.99,1.01) ~
BenchmarkFannkuch11 4.42s × (1.00,1.00) 4.36s × (1.00,1.00) -1.39%
BenchmarkFmtFprintfEmpty 118ns × (0.96,1.02) 120ns × (0.99,1.06) ~
BenchmarkFmtFprintfString 486ns × (0.99,1.01) 480ns × (0.99,1.01) -1.34%
BenchmarkFmtFprintfInt 457ns × (0.99,1.01) 451ns × (0.99,1.01) -1.31%
BenchmarkFmtFprintfIntInt 768ns × (1.00,1.01) 766ns × (0.99,1.01) ~
BenchmarkFmtFprintfPrefixedInt 584ns × (0.99,1.03) 569ns × (0.99,1.01) -2.57%
BenchmarkFmtFprintfFloat 739ns × (0.99,1.00) 728ns × (1.00,1.01) -1.49%
BenchmarkFmtManyArgs 2.77µs × (1.00,1.00) 2.81µs × (1.00,1.01) +1.53%
BenchmarkGobDecode 39.3ms × (0.99,1.01) 39.4ms × (0.99,1.01) ~
BenchmarkGobEncode 39.4ms × (0.99,1.00) 39.4ms × (0.99,1.00) ~
BenchmarkGzip 661ms × (0.99,1.01) 660ms × (1.00,1.01) ~
BenchmarkGunzip 142ms × (1.00,1.00) 143ms × (1.00,1.00) +0.20%
BenchmarkHTTPClientServer 133µs × (0.98,1.01) 132µs × (0.99,1.01) ~
BenchmarkJSONEncode 56.5ms × (0.99,1.01) 57.1ms × (0.99,1.01) +0.94%
BenchmarkJSONDecode 143ms × (1.00,1.00) 138ms × (1.00,1.01) -3.22%
BenchmarkMandelbrot200 6.01ms × (1.00,1.00) 6.02ms × (1.00,1.00) ~
BenchmarkGoParse 9.63ms × (0.94,1.07) 9.79ms × (0.92,1.07) ~
BenchmarkRegexpMatchEasy0_32 210ns × (1.00,1.00) 210ns × (1.00,1.01) ~
BenchmarkRegexpMatchEasy0_1K 596ns × (0.99,1.01) 593ns × (0.99,1.01) ~
BenchmarkRegexpMatchEasy1_32 184ns × (0.99,1.01) 182ns × (0.99,1.01) ~
BenchmarkRegexpMatchEasy1_1K 1.01µs × (0.99,1.01) 1.01µs × (1.00,1.01) ~
BenchmarkRegexpMatchMedium_32 327ns × (1.00,1.01) 331ns × (1.00,1.00) +1.22%
BenchmarkRegexpMatchMedium_1K 93.0µs × (1.00,1.02) 92.6µs × (1.00,1.01) ~
BenchmarkRegexpMatchHard_32 4.76µs × (0.95,1.01) 4.58µs × (0.99,1.05) ~
BenchmarkRegexpMatchHard_1K 136µs × (1.00,1.01) 136µs × (1.00,1.01) ~
BenchmarkRevcomp 892ms × (1.00,1.01) 900ms × (0.99,1.06) ~
BenchmarkTemplate 175ms × (0.99,1.00) 171ms × (1.00,1.01) -2.36%
BenchmarkTimeParse 638ns × (1.00,1.00) 637ns × (1.00,1.00) ~
BenchmarkTimeFormat 772ns × (1.00,1.00) 742ns × (1.00,1.00) -3.95%

Change-Id: I6504e310cb9cf48a73d539c478b4dbcacde208b2
Reviewed-on: https://go-review.googlesource.com/9308Reviewed-by: Austin Clements <austin@google.com>

0f0bc0f0

cmd/internal/gc: emit write barriers at lower level · 0ad4f8b1

Russ Cox authored Apr 17, 2015

This is primarily preparation for inlining, not an optimization by itself,
but it still helps some.

name old new delta
BenchmarkBinaryTree17 18.2s × (0.99,1.01) 17.9s × (0.99,1.01) -1.57%
BenchmarkFannkuch11 4.44s × (1.00,1.00) 4.42s × (1.00,1.00) -0.40%
BenchmarkFmtFprintfEmpty 119ns × (0.95,1.02) 118ns × (0.96,1.02) ~
BenchmarkFmtFprintfString 501ns × (0.99,1.02) 486ns × (0.99,1.01) -2.89%
BenchmarkFmtFprintfInt 474ns × (0.99,1.00) 457ns × (0.99,1.01) -3.59%
BenchmarkFmtFprintfIntInt 792ns × (1.00,1.00) 768ns × (1.00,1.01) -3.03%
BenchmarkFmtFprintfPrefixedInt 574ns × (1.00,1.01) 584ns × (0.99,1.03) +1.83%
BenchmarkFmtFprintfFloat 749ns × (1.00,1.00) 739ns × (0.99,1.00) -1.34%
BenchmarkFmtManyArgs 2.94µs × (1.00,1.01) 2.77µs × (1.00,1.00) -5.76%
BenchmarkGobDecode 39.5ms × (0.99,1.01) 39.3ms × (0.99,1.01) ~
BenchmarkGobEncode 39.4ms × (1.00,1.01) 39.4ms × (0.99,1.00) ~
BenchmarkGzip 658ms × (1.00,1.01) 661ms × (0.99,1.01) ~
BenchmarkGunzip 142ms × (1.00,1.00) 142ms × (1.00,1.00) +0.22%
BenchmarkHTTPClientServer 134µs × (0.99,1.01) 133µs × (0.98,1.01) ~
BenchmarkJSONEncode 57.1ms × (0.99,1.01) 56.5ms × (0.99,1.01) ~
BenchmarkJSONDecode 141ms × (1.00,1.00) 143ms × (1.00,1.00) +1.09%
BenchmarkMandelbrot200 6.01ms × (1.00,1.00) 6.01ms × (1.00,1.00) ~
BenchmarkGoParse 10.1ms × (0.91,1.09) 9.6ms × (0.94,1.07) ~
BenchmarkRegexpMatchEasy0_32 207ns × (1.00,1.01) 210ns × (1.00,1.00) +1.45%
BenchmarkRegexpMatchEasy0_1K 592ns × (0.99,1.00) 596ns × (0.99,1.01) +0.68%
BenchmarkRegexpMatchEasy1_32 184ns × (0.99,1.01) 184ns × (0.99,1.01) ~
BenchmarkRegexpMatchEasy1_1K 1.01µs × (1.00,1.00) 1.01µs × (0.99,1.01) ~
BenchmarkRegexpMatchMedium_32 327ns × (0.99,1.00) 327ns × (1.00,1.01) ~
BenchmarkRegexpMatchMedium_1K 92.5µs × (1.00,1.00) 93.0µs × (1.00,1.02) +0.48%
BenchmarkRegexpMatchHard_32 4.79µs × (0.95,1.00) 4.76µs × (0.95,1.01) ~
BenchmarkRegexpMatchHard_1K 136µs × (1.00,1.00) 136µs × (1.00,1.01) ~
BenchmarkRevcomp 900ms × (0.99,1.01) 892ms × (1.00,1.01) ~
BenchmarkTemplate 170ms × (0.99,1.01) 175ms × (0.99,1.00) +2.95%
BenchmarkTimeParse 645ns × (1.00,1.00) 638ns × (1.00,1.00) -1.16%
BenchmarkTimeFormat 740ns × (1.00,1.00) 772ns × (1.00,1.00) +4.39%

Change-Id: I0be905e32791e0cb70ff01f169c4b309a971d981
Reviewed-on: https://go-review.googlesource.com/9159Reviewed-by: Rick Hudson <rlh@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

0ad4f8b1

test: gofmt run.go · 673bd188

Josh Bleecher Snyder authored Apr 27, 2015

Clean up after CL 5310.

Change-Id: Ib870e7b9d26eb118eefdaa3e76dcec4a4d459584
Reviewed-on: https://go-review.googlesource.com/9398Reviewed-by: Ian Lance Taylor <iant@golang.org>

673bd188

test: set GOMAXPROCS=1 in fixedbugs/issue9110 · 1fb948a0

Josh Bleecher Snyder authored Apr 27, 2015

With this fix,

GOMAXPROCS=8 ./all.bash

passes, at least on my machine.

Fixes #10216.

Change-Id: Ib5991950892a1399ec81aced0a52b435e6f83fdf
Reviewed-on: https://go-review.googlesource.com/9392Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

1fb948a0

net: don't miss testing server teardowns when test fails early · 9bef5cfb

Mikio Hara authored Apr 25, 2015

Change-Id: I9fa678e43b4ae3970323cac474b5f86d4d933997
Reviewed-on: https://go-review.googlesource.com/9382Reviewed-by: Ian Lance Taylor <iant@golang.org>

9bef5cfb

27 Apr, 2015 17 commits

test: reenable syntax tests · 8a413752

Matthew Dempsky authored Apr 27, 2015

These were fixed a little while ago, but overlooked when reenabling
disabled tests.

Update #9968.

Change-Id: I301ef587e580c517a170ad08ff897118b58cedec
Reviewed-on: https://go-review.googlesource.com/9347
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>

8a413752

doc/go1.5.txt: go doc · 181e81cf

Rob Pike authored Apr 27, 2015

Change-Id: I883017b67e8fa76b6f123e8f9bcec3d6f820bbb3
Reviewed-on: https://go-review.googlesource.com/9348Reviewed-by: Rob Pike <r@golang.org>

181e81cf

cmd/go,cmd/doc: add "go doc" · a5de54a8

Rob Pike authored Apr 24, 2015

Add the new go doc command to the go command, installed in
the tool directory.

(Still to do: tests)

Fix cmd/dist to remove old "package documentation" code that was
stopping it from including cmd/go/doc.go in the build.

Implement the doc command. Here is the help info from "go help doc":

===
usage: go doc [-u] [package|[package.]symbol[.method]]

Doc accepts at most one argument, indicating either a package, a symbol within a
package, or a method of a symbol.

	go doc
	go doc <pkg>
	go doc <sym>[.<method>]
	go doc [<pkg>].<sym>[.<method>]

Doc interprets the argument to see what it represents, determined by its syntax
and which packages and symbols are present in the source directories of GOROOT and
GOPATH.

The first item in this list that succeeds is the one whose documentation is printed.
For packages, the order of scanning is determined by the file system, however the
GOROOT tree is always scanned before GOPATH.

If there is no package specified or matched, the package in the current directory
is selected, so "go doc" shows the documentation for the current package and
"go doc Foo" shows the documentation for symbol Foo in the current package.

Doc prints the documentation comments associated with the top-level item the
argument identifies (package, type, method) followed by a one-line summary of each
of the first-level items "under" that item (package-level declarations for a
package, methods for a type, etc.)

The package paths must be either a qualified path or a proper suffix of a path
(see examples below). The go tool's usual package mechanism does not apply: package
path elements like . and ...  are not implemented by go doc.

When matching symbols, lower-case letters match either case but upper-case letters
match exactly.

Examples:
	go doc
		Show documentation for current package.
	go doc Foo
		Show documentation for Foo in the current package.
		(Foo starts with a capital letter so it cannot match a package path.)
	go doc json
		Show documentation for the encoding/json package.
	go doc json
		Shorthand for encoding/json assuming only one json package
		is present in the tree.
	go doc json.Number (or go doc json.number)
		Show documentation and method summary for json.Number.
	go doc json.Number.Int64 (or go doc json.number.int64)
		Show documentation for the Int64 method of json.Number.

Flags:
	-u
		Show documentation for unexported as well as exported
		symbols and methods.

===

Still to do:

Tests.
Disambiguation when there is both foo and Foo.
Flag for case-sensitive matching.

Change-Id: I83d409a68688a5445f54297a7e7c745f749b9e66
Reviewed-on: https://go-review.googlesource.com/9227Reviewed-by: Russ Cox <rsc@golang.org>

a5de54a8

runtime/race: fix failing tests · 02ba71e5

Austin Clements authored Apr 27, 2015

Some race tests were sensitive to the goroutine scheduling order.
When this changed in commit e870f06c, these tests started to fail.

Fix TestRaceHeapParam by ensuring that the racing goroutine has
run before the test exits. Fix TestRaceRWMutexMultipleReaders by
adding a third reader to ensure that two readers wind up on the
same side of the writer (and race with each other) regardless of
the schedule. Fix TestRaceRange by ensuring that the racing
goroutine runs before the main goroutine exits the loop it races
with.

Change-Id: Iaf002f8730ea42227feaf2f3c51b9a1e57ccffdd
Reviewed-on: https://go-review.googlesource.com/9402Reviewed-by: Russ Cox <rsc@golang.org>

02ba71e5

runtime/race: stop listening to external network addresses · f774e6a1

Russ Cox authored Apr 27, 2015

This makes the OS X firewall box pop up.
Not run during all.bash so hasn't been noticed before.

Change-Id: I78feb4fd3e1d3c983ae3419085048831c04de3da
Reviewed-on: https://go-review.googlesource.com/9401Reviewed-by: Austin Clements <austin@google.com>

f774e6a1

runtime: fix stack use accounting · 7c7cd695

Austin Clements authored Apr 27, 2015

ReadMemStats accounts for stacks slightly differently than the runtime
does internally. Internally, only stacks allocated by newosproc0 are
accounted in memstats.stacks_sys and other stacks are accounted in
heap_sys. readmemstats_m shuffles the statistics so all stacks are
accounted in StackSys rather than HeapSys.

However, currently, readmemstats_m assumes StackSys will be zero when
it does this shuffle. This was true until commit 6ad33be2. If it isn't
(e.g., if something called newosproc0), StackSys+HeapSys will be
different before and after this shuffle, and the Sys sum that was
computed earlier will no longer agree with the sum of its components.

Fix this by making the shuffle in readmemstats_m not assume that
StackSys is zero.

Fixes #10585.

Change-Id: If13991c8de68bd7b85e1b613d3f12b4fd6fd5813
Reviewed-on: https://go-review.googlesource.com/9366Reviewed-by: Russ Cox <rsc@golang.org>

7c7cd695

runtime: remove unnecessary noescape to fix netbsd · d707a6e0

David Crawshaw authored Apr 27, 2015

I introduced this build failure in golang.org/cl/9302 but failed to
notice due to the other failures on the dashboard.

Change-Id: I84bf00f664ba572c1ca722e0136d8a2cf21613ca
Reviewed-on: https://go-review.googlesource.com/9363Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Minux Ma <minux@golang.org>

d707a6e0

cmd/internal/gc, cmd/internal/ld: add memprofilerate flag · 00d4a6b3

Josh Bleecher Snyder authored Apr 23, 2015

Also call runtime.GC before exit to ensure
that the profiler picks up all allocations.

Fixes #10537.

Change-Id: Ibfbfc88652ac0ce30a6d1ae392f919df6c1e8126
Reviewed-on: https://go-review.googlesource.com/9261Reviewed-by: Dave Cheney <dave@cheney.net>
Reviewed-by: Minux Ma <minux@golang.org>
Run-TryBot: Minux Ma <minux@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>

00d4a6b3

runtime/race: fix benchmark deadlock · 23ce80ef

Austin Clements authored Apr 27, 2015

Currently TestRaceCrawl fails to wg.Done for every wg.Adds if the
depth ever reaches 0. This causes the test to deadlock. Under the race
detector, this deadlock is not detected, so the test eventually times
out.

This only recently became a problem. Prior to commit e870f06c the depth
would never reach 0 because the strict round-robin goroutine schedule
ensured that all of the URLs were already "seen" by depth 2. Now that
the runtime prefers scheduling the most recently started goroutine,
the test is able to reach depth 0 and trigger this deadlock.

Change-Id: I5176302a89614a344c84d587073b364833af6590
Reviewed-on: https://go-review.googlesource.com/9344
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Russ Cox <rsc@golang.org>

23ce80ef

regexp: trivial change in comments to update code.google.com link · 8cb9c21c

Dmitry Savintsev authored Apr 27, 2015

Replaced code.google.com/p/re2/ with github.com/google/re2/ and
updated the file names (re2-exhaustive.txt.bz2 not re2.txt.gz)
as well as the re2 make command (make log).

Change-Id: I15937b0b8a898d78d45366857ed86421c8d69960
Reviewed-on: https://go-review.googlesource.com/9372Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

8cb9c21c

runtime: fix race in BenchmarkPingPongHog · 42da2700

Russ Cox authored Apr 27, 2015

The master goroutine was returning before
the child goroutine had done its final i < b.N
(the one that fails and causes it to exit the loop)
and then the benchmark harness was updating
b.N, causing a read+write race on b.N.

Change-Id: I2504270a0de30544736f6c32161337a25b505c3e
Reviewed-on: https://go-review.googlesource.com/9368Reviewed-by: Austin Clements <austin@google.com>

42da2700

runtime: fix some out of date comments and typos · 33e0f3d8

Austin Clements authored Apr 27, 2015

Change-Id: I061057414c722c5a0f03c709528afc8554114db6
Reviewed-on: https://go-review.googlesource.com/9367Reviewed-by: Rick Hudson <rlh@golang.org>

33e0f3d8

runtime: remove a modulus calculation from pollorder · 9a0fd97f

Josh Bleecher Snyder authored Apr 27, 2015

This is a follow-up to CL 9269, as suggested
by dvyukov.

There is probably even more that can be done
to speed up this shuffle. It will matter more
once CL 7570 (fine-grained locking in select)
is in and can be revisited then, with benchmarks.

Change-Id: Ic13a27d11cedd1e1f007951214b3bb56b1644f02
Reviewed-on: https://go-review.googlesource.com/9393Reviewed-by: Dmitry Vyukov <dvyukov@google.com>

9a0fd97f

runtime: rename gcController.findRunnable to findRunnableGCWorker · 1b01910c

Austin Clements authored Apr 24, 2015

This avoids confusion with the main findrunnable in the scheduler.

Change-Id: I8cf40657557a8610a2fe5a2f74598518256ca7f0
Reviewed-on: https://go-review.googlesource.com/9305Reviewed-by: Rick Hudson <rlh@golang.org>

1b01910c

runtime: replace STW for enabling write barriers with ragged barrier · bb632053

Austin Clements authored Mar 27, 2015

Currently, we use a full stop-the-world around enabling write
barriers. This is to ensure that all Gs have enabled write barriers
before any blackening occurs (either in gcBgMarkWorker() or in
gcAssistAlloc()).

However, there's no need to bring the whole world to a synchronous
stop to ensure this. This change replaces the STW with a ragged
barrier that ensures each P has individually observed that write
barriers should be enabled before GC performs any blackening.

Change-Id: If2f129a6a55bd8bdd4308067af2b739f3fb41955
Reviewed-on: https://go-review.googlesource.com/8207Reviewed-by: Russ Cox <rsc@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>

bb632053

runtime: add ragged global barrier function · 57afa764

Austin Clements authored Mar 27, 2015

This adds forEachP, which performs a general-purpose ragged global
barrier. forEachP takes a callback and invokes it for every P at a GC
safe point.

Ps that are idle or in a syscall are considered to be at a continuous
safe point. forEachP ensures that these Ps do not change state by
forcing all syscall Ps into idle and holding the sched.lock.

To ensure that Ps do not enter syscall or idle without running the
safe-point function, this adds checks for a pending callback every
place there is currently a gcwaiting check.

We'll use forEachP to replace the STW around enabling the write
barrier and to replace the current asynchronous per-M wbuf cache with
a cooperatively managed per-P gcWork cache.

Change-Id: Ie944f8ce1fead7c79bf271d2f42fcd61a41bb3cc
Reviewed-on: https://go-review.googlesource.com/8206Reviewed-by: Russ Cox <rsc@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>

57afa764

Revert "cmd/dist: consolidate runtime CPU tests" · 81c2233b

Josh Bleecher Snyder authored Apr 27, 2015

This reverts commit a9e50a6b.

Change-Id: I3c5e459f1030e36bc249910facdae12303a44151
Reviewed-on: https://go-review.googlesource.com/9394Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>

81c2233b