• Michael Anthony Knyszek's avatar
    runtime: allocate from free and scav fairly · 06484245
    Michael Anthony Knyszek authored
    This change modifies the behavior of span allocations to no longer
    prefer the free treap over the scavenged treap.
    
    While there is an additional cost to allocating out of the scavenged
    treap, the current behavior of preferring the unscavenged spans can
    lead to unbounded growth of a program's virtual memory footprint.
    
    In small programs (low # of Ps, low resident set size, low allocation
    rate) this behavior isn't really apparent and is difficult to
    reproduce.
    
    However, in relatively large, long-running programs we see this
    unbounded growth in free spans, and an unbounded amount of heap
    growths.
    
    It still remains unclear how this policy change actually ends up
    increasing the number of heap growths over time, but switching the
    policy back to best-fit does indeed solve the problem.
    
    Change-Id: Ibb88d24f9ef6766baaa7f12b411974cc03341e7b
    Reviewed-on: https://go-review.googlesource.com/c/148979
    Run-TryBot: Michael Knyszek <mknyszek@google.com>
    TryBot-Result: Gobot Gobot <gobot@golang.org>
    Reviewed-by: 's avatarRick Hudson <rlh@golang.org>
    Reviewed-by: 's avatarAustin Clements <austin@google.com>
    06484245
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