diff options
Diffstat (limited to 'pkg/sentry/control/pprof.go')
| -rw-r--r-- | pkg/sentry/control/pprof.go | 30 |
1 files changed, 21 insertions, 9 deletions
diff --git a/pkg/sentry/control/pprof.go b/pkg/sentry/control/pprof.go index 2f3664c57..f721b7236 100644 --- a/pkg/sentry/control/pprof.go +++ b/pkg/sentry/control/pprof.go @@ -26,6 +26,23 @@ import ( "gvisor.dev/gvisor/pkg/urpc" ) +const ( + // DefaultBlockProfileRate is the default profiling rate for block + // profiles. + // + // The default here is 10%, which will record a stacktrace 10% of the + // time when blocking occurs. Since these events should not be super + // frequent, we expect this to achieve a reasonable balance between + // collecting the data we need and imposing a high performance cost + // (e.g. skewing even the CPU profile). + DefaultBlockProfileRate = 10 + + // DefaultMutexProfileRate is the default profiling rate for mutex + // profiles. Like the block rate above, we use a default rate of 10% + // for the same reasons. + DefaultMutexProfileRate = 10 +) + // Profile includes profile-related RPC stubs. It provides a way to // control the built-in runtime profiling facilities. // @@ -175,12 +192,8 @@ func (p *Profile) Block(o *BlockProfileOpts, _ *struct{}) error { defer p.blockMu.Unlock() // Always set the rate. We then wait to collect a profile at this rate, - // and disable when we're done. Note that the default here is 10%, which - // will record a stacktrace 10% of the time when blocking occurs. Since - // these events should not be super frequent, we expect this to achieve - // a reasonable balance between collecting the data we need and imposing - // a high performance cost (e.g. skewing even the CPU profile). - rate := 10 + // and disable when we're done. + rate := DefaultBlockProfileRate if o.Rate != 0 { rate = o.Rate } @@ -220,9 +233,8 @@ func (p *Profile) Mutex(o *MutexProfileOpts, _ *struct{}) error { p.mutexMu.Lock() defer p.mutexMu.Unlock() - // Always set the fraction. Like the block rate above, we use - // a default rate of 10% for the same reasons. - fraction := 10 + // Always set the fraction. + fraction := DefaultMutexProfileRate if o.Fraction != 0 { fraction = o.Fraction } |