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runtime: Add memprofilerate to GODEBUG

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Add memprofilerate as a value recognized
in the GODEBUG env var.  The value provided
is used as the new setting for
runtime.MemProfileRate, allowing the user
to adjust memory profiling.

From-SVN: r220470
This commit is contained in:
Ian Lance Taylor 2015-02-06 05:03:22 +00:00
parent c4feb478a6
commit 8c5c44aa7e
2 changed files with 19 additions and 1 deletions
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4
libgo/go/runtime/extern.go
View File

@ -39,6 +39,10 @@ a comma-separated list of name=val pairs. Supported names are:
gcdead: setting gcdead=1 causes the garbage collector to clobber all stack slots
that it thinks are dead.
memprofilerate: setting memprofilerate=X changes the setting for
runtime.MemProfileRate. Refer to the description of this variable for how
it is used and its default value.
scheddetail: setting schedtrace=X and scheddetail=1 causes the scheduler to emit
detailed multiline info every X milliseconds, describing state of the scheduler,
processors, threads and goroutines.

16
libgo/runtime/runtime.c
View File

@ -22,6 +22,10 @@ enum {
// gotraceback value.
static uint32 traceback_cache = ~(uint32)0;
extern volatile intgo runtime_MemProfileRate
__asm__ (GOSYM_PREFIX "runtime.MemProfileRate");
// The GOTRACEBACK environment variable controls the
// behavior of a Go program that is crashing and exiting.
// GOTRACEBACK=0 suppress all tracebacks
@ -315,6 +319,11 @@ runtime_signalstack(byte *p, int32 n)
DebugVars runtime_debug;
// Holds variables parsed from GODEBUG env var,
// except for "memprofilerate" since there is an
// existing var for that value which is int
// instead of in32 and might have an
// initial value.
static struct {
const char* name;
int32* value;
@ -349,7 +358,12 @@ runtime_parsedebugvars(void)
for(;;) {
for(i=0; i<(intgo)nelem(dbgvar); i++) {
n = runtime_findnull((const byte*)dbgvar[i].name);
if(runtime_mcmp(p, dbgvar[i].name, n) == 0 && p[n] == '=')
if(runtime_mcmp(p, "memprofilerate", n) == 0 && p[n] == '=')
// Set the MemProfileRate directly since it
// is an int, not int32, and should only lbe
// set here if specified by GODEBUG
runtime_MemProfileRate = runtime_atoi(p+n+1);
else if(runtime_mcmp(p, dbgvar[i].name, n) == 0 && p[n] == '=')
*dbgvar[i].value = runtime_atoi(p+n+1);
}
p = (const byte *)runtime_strstr((const char *)p, ",");