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Bug 901481 - add an environment variable to set the number of entries kept by the profiler, r=BenWa

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This commit is contained in:
Gijs Kruitbosch 2013-08-05 18:03:22 +02:00
parent 1346ad834d
commit e360e1c3bc
3 changed files with 25 additions and 0 deletions
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1
tools/profiler/BreakpadSampler.cpp
View File

@ -54,6 +54,7 @@
UnwMode sUnwindMode = UnwINVALID;
int sUnwindInterval = 0;
int sUnwindStackScan = 0;
int sProfileEntries = 0;
using std::string;
using namespace mozilla;

22
tools/profiler/platform.cpp
View File

@ -171,13 +171,16 @@ void read_profiler_env_vars()
MOZ_ASSERT(sUnwindMode == UnwINVALID);
MOZ_ASSERT(sUnwindInterval == 0);
MOZ_ASSERT(sProfileEntries == 0);
/* Set defaults */
sUnwindMode = nativeAvail ? UnwCOMBINED : UnwPSEUDO;
sUnwindInterval = 0; /* We'll have to look elsewhere */
sProfileEntries = 0;
const char* strM = PR_GetEnv("MOZ_PROFILER_MODE");
const char* strI = PR_GetEnv("MOZ_PROFILER_INTERVAL");
const char* strE = PR_GetEnv("MOZ_PROFILER_ENTRIES");
const char* strF = PR_GetEnv("MOZ_PROFILER_STACK_SCAN");
if (strM) {
@ -199,6 +202,15 @@ void read_profiler_env_vars()
else goto usage;
}
if (strE) {
errno = 0;
long int n = strtol(strE, (char**)NULL, 10);
if (errno == 0 && n > 0) {
sProfileEntries = n;
}
else goto usage;
}
if (strF) {
errno = 0;
long int n = strtol(strF, (char**)NULL, 10);
@ -223,6 +235,9 @@ void read_profiler_env_vars()
LOG( "SPS: MOZ_PROFILER_INTERVAL=<number> (milliseconds, 1 to 1000)");
LOG( "SPS: If unset, platform default is used.");
LOG( "SPS: ");
LOG( "SPS: MOZ_PROFILER_ENTRIES=<number> (count, minimum of 1)");
LOG( "SPS: If unset, platform default is used.");
LOG( "SPS: ");
LOG( "SPS: MOZ_PROFILER_VERBOSE");
LOG( "SPS: If set to any value, increases verbosity (recommended).");
LOG( "SPS: ");
@ -238,6 +253,7 @@ void read_profiler_env_vars()
/* Re-set defaults */
sUnwindMode = nativeAvail ? UnwCOMBINED : UnwPSEUDO;
sUnwindInterval = 0; /* We'll have to look elsewhere */
sProfileEntries = 0;
sUnwindStackScan = 0;
out:
@ -245,6 +261,8 @@ void read_profiler_env_vars()
LOGF("SPS: Unwind mode = %s", name_UnwMode(sUnwindMode));
LOGF("SPS: Sampling interval = %d ms (zero means \"platform default\")",
(int)sUnwindInterval);
LOGF("SPS: Entry store size = %d (zero means \"platform default\")",
(int)sProfileEntries);
LOGF("SPS: UnwindStackScan = %d (max dubious frames per unwind).",
(int)sUnwindStackScan);
LOG( "SPS: Use env var MOZ_PROFILER_MODE=help for further information.");
@ -431,6 +449,10 @@ void mozilla_sampler_start(int aProfileEntries, int aInterval,
if (sUnwindInterval > 0)
aInterval = sUnwindInterval;
/* If the entry count was set using env vars, use that, too: */
if (sProfileEntries > 0)
aProfileEntries = sProfileEntries;
// Reset the current state if the profiler is running
profiler_stop();

2
tools/profiler/platform.h
View File

@ -238,6 +238,8 @@ extern UnwMode sUnwindMode; /* what mode? */
extern int sUnwindInterval; /* in milliseconds */
extern int sUnwindStackScan; /* max # of dubious frames allowed */
extern int sProfileEntries; /* how many entries do we store? */
// ----------------------------------------------------------------------------
// Sampler