diff options
Diffstat (limited to 'src/runtime/runtime1.go')
| -rw-r--r-- | src/runtime/runtime1.go | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/src/runtime/runtime1.go b/src/runtime/runtime1.go index 7c893aa25c..30b7044bff 100644 --- a/src/runtime/runtime1.go +++ b/src/runtime/runtime1.go @@ -300,7 +300,6 @@ type dbgVar struct { // existing int var for that value, which may // already have an initial value. var debug struct { - allocfreetrace int32 cgocheck int32 clobberfree int32 efence int32 @@ -311,13 +310,20 @@ var debug struct { gctrace int32 invalidptr int32 madvdontneed int32 // for Linux; issue 28466 - sbrk int32 scavenge int32 scavtrace int32 scheddetail int32 schedtrace int32 tracebackancestors int32 asyncpreemptoff int32 + + // debug.malloc is used as a combined debug check + // in the malloc function and should be set + // if any of the below debug options is != 0. + malloc bool + allocfreetrace int32 + inittrace int32 + sbrk int32 } var dbgvars = []dbgVar{ @@ -339,12 +345,24 @@ var dbgvars = []dbgVar{ {"schedtrace", &debug.schedtrace}, {"tracebackancestors", &debug.tracebackancestors}, {"asyncpreemptoff", &debug.asyncpreemptoff}, + {"inittrace", &debug.inittrace}, } func parsedebugvars() { // defaults debug.cgocheck = 1 debug.invalidptr = 1 + if GOOS == "linux" { + // On Linux, MADV_FREE is faster than MADV_DONTNEED, + // but doesn't affect many of the statistics that + // MADV_DONTNEED does until the memory is actually + // reclaimed. This generally leads to poor user + // experience, like confusing stats in top and other + // monitoring tools; and bad integration with + // management systems that respond to memory usage. + // Hence, default to MADV_DONTNEED. + debug.madvdontneed = 1 + } for p := gogetenv("GODEBUG"); p != ""; { field := "" @@ -378,6 +396,8 @@ func parsedebugvars() { } } + debug.malloc = (debug.allocfreetrace | debug.inittrace | debug.sbrk) != 0 + setTraceback(gogetenv("GOTRACEBACK")) traceback_env = traceback_cache } |