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| author | Austin Clements <austin@google.com> | 2016-12-06 17:42:42 -0500 |
|---|---|---|
| committer | Austin Clements <austin@google.com> | 2016-12-07 20:59:16 +0000 |
| commit | 01c6a19e041f6b316c17a065f7a42b8dab57c9da (patch) | |
| tree | 6a67ca68f6df3ba461a717ab3591dc2bddd8381c /src/runtime/mstats.go | |
| parent | d4177877c6d6e710d77dd8c94b91f8567f1aaa87 (diff) | |
| download | go-01c6a19e041f6b316c17a065f7a42b8dab57c9da.tar.gz go-01c6a19e041f6b316c17a065f7a42b8dab57c9da.zip | |
runtime: add number of forced GCs to MemStats
This adds a counter for the number of times the application forced a
GC by, e.g., calling runtime.GC(). This is useful for detecting
applications that are overusing/abusing runtime.GC() or
debug.FreeOSMemory().
Fixes #18217.
Change-Id: I990ab7a313c1b3b7a50a3d44535c460d7c54f47d
Reviewed-on: https://go-review.googlesource.com/34067
Reviewed-by: Russ Cox <rsc@golang.org>
Diffstat (limited to 'src/runtime/mstats.go')
| -rw-r--r-- | src/runtime/mstats.go | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/src/runtime/mstats.go b/src/runtime/mstats.go index b80ab11389..4e111a14fe 100644 --- a/src/runtime/mstats.go +++ b/src/runtime/mstats.go @@ -77,6 +77,7 @@ type mstats struct { pause_ns [256]uint64 // circular buffer of recent gc pause lengths pause_end [256]uint64 // circular buffer of recent gc end times (nanoseconds since 1970) numgc uint32 + numforcedgc uint32 // number of user-forced GCs gc_cpu_fraction float64 // fraction of CPU time used by GC enablegc bool debuggc bool @@ -100,8 +101,6 @@ type mstats struct { // must be complete. gc_trigger uint64 - _ uint32 // force 8-byte alignment of heap_live and prevent an alignment check crash on MIPS32. - // heap_live is the number of bytes considered live by the GC. // That is: retained by the most recent GC plus allocated // since then. heap_live <= heap_alloc, since heap_alloc @@ -365,6 +364,10 @@ type MemStats struct { // NumGC is the number of completed GC cycles. NumGC uint32 + // NumForcedGC is the number of GC cycles that were forced by + // the application calling the GC function. + NumForcedGC uint32 + // GCCPUFraction is the fraction of this program's available // CPU time used by the GC since the program started. // |