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runtime: improve MemStats comments

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This tries to clarify that Alloc and HeapAlloc are tied to how much
freeing has been done by the sweeper.

Change-Id: Id8320074bd75de791f39ec01bac99afe28052d02
Reviewed-on: https://go-review.googlesource.com/8354
Reviewed-by: Rick Hudson <rlh@golang.org>
This commit is contained in:
Austin Clements 2015-03-30 16:59:09 -04:00
parent 52c84c34fd
commit 6134caf1f9
1 changed files with 4 additions and 4 deletions
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8
src/runtime/mstats.go
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@ -12,7 +12,7 @@ import "unsafe"
// Shared with Go: if you edit this structure, also edit type MemStats in mem.go.
type mstats struct {
// General statistics.
alloc uint64 // bytes allocated and still in use
alloc uint64 // bytes allocated and not yet freed
total_alloc uint64 // bytes allocated (even if freed)
sys uint64 // bytes obtained from system (should be sum of xxx_sys below, no locking, approximate)
nlookup uint64 // number of pointer lookups
@ -21,7 +21,7 @@ type mstats struct {
// Statistics about malloc heap.
// protected by mheap.lock
heap_alloc uint64 // bytes allocated and still in use
heap_alloc uint64 // bytes allocated and not yet freed (same as alloc above)
heap_sys uint64 // bytes obtained from system
heap_idle uint64 // bytes in idle spans
heap_inuse uint64 // bytes in non-idle spans
@ -67,7 +67,7 @@ var memstats mstats
// A MemStats records statistics about the memory allocator.
type MemStats struct {
// General statistics.
Alloc uint64 // bytes allocated and still in use
Alloc uint64 // bytes allocated and not yet freed
TotalAlloc uint64 // bytes allocated (even if freed)
Sys uint64 // bytes obtained from system (sum of XxxSys below)
Lookups uint64 // number of pointer lookups
@ -75,7 +75,7 @@ type MemStats struct {
Frees uint64 // number of frees
// Main allocation heap statistics.
HeapAlloc uint64 // bytes allocated and still in use
HeapAlloc uint64 // bytes allocated and not yet freed (same as Alloc above)
HeapSys uint64 // bytes obtained from system
HeapIdle uint64 // bytes in idle spans
HeapInuse uint64 // bytes in non-idle span