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| author | fabient <fabient@FreeBSD.org> | 2012-03-28 20:58:30 +0000 |
|---|---|---|
| committer | fabient <fabient@FreeBSD.org> | 2012-03-28 20:58:30 +0000 |
| commit | 5edfb77dd3a164bb9d2d40c6604faa6c9f3dce15 (patch) | |
| tree | fadff08d26576c3d5c1cef9d47abd784602b237a /sys/dev/hwpmc/hwpmc_logging.c | |
| parent | 9a7982e5a0267c0421856f3a43a1ae75880058f3 (diff) | |
| download | FreeBSD-src-5edfb77dd3a164bb9d2d40c6604faa6c9f3dce15.zip FreeBSD-src-5edfb77dd3a164bb9d2d40c6604faa6c9f3dce15.tar.gz | |
Add software PMC support.
New kernel events can be added at various location for sampling or counting.
This will for example allow easy system profiling whatever the processor is
with known tools like pmcstat(8).
Simultaneous usage of software PMC and hardware PMC is possible, for example
looking at the lock acquire failure, page fault while sampling on
instructions.
Sponsored by: NETASQ
MFC after: 1 month
Diffstat (limited to 'sys/dev/hwpmc/hwpmc_logging.c')
| -rw-r--r-- | sys/dev/hwpmc/hwpmc_logging.c | 28 |
1 files changed, 23 insertions, 5 deletions
diff --git a/sys/dev/hwpmc/hwpmc_logging.c b/sys/dev/hwpmc/hwpmc_logging.c index 79170ed..880bcaa 100644 --- a/sys/dev/hwpmc/hwpmc_logging.c +++ b/sys/dev/hwpmc/hwpmc_logging.c @@ -129,6 +129,7 @@ static struct mtx pmc_kthread_mtx; /* sleep lock */ /* Emit a string. Caution: does NOT update _le, so needs to be last */ #define PMCLOG_EMITSTRING(S,L) do { bcopy((S), _le, (L)); } while (0) +#define PMCLOG_EMITNULLSTRING(L) do { bzero(_le, (L)); } while (0) #define PMCLOG_DESPATCH(PO) \ pmclog_release((PO)); \ @@ -835,16 +836,33 @@ void pmclog_process_pmcallocate(struct pmc *pm) { struct pmc_owner *po; + struct pmc_soft *ps; po = pm->pm_owner; PMCDBG(LOG,ALL,1, "pm=%p", pm); - PMCLOG_RESERVE(po, PMCALLOCATE, sizeof(struct pmclog_pmcallocate)); - PMCLOG_EMIT32(pm->pm_id); - PMCLOG_EMIT32(pm->pm_event); - PMCLOG_EMIT32(pm->pm_flags); - PMCLOG_DESPATCH(po); + if (PMC_TO_CLASS(pm) == PMC_CLASS_SOFT) { + PMCLOG_RESERVE(po, PMCALLOCATEDYN, + sizeof(struct pmclog_pmcallocatedyn)); + PMCLOG_EMIT32(pm->pm_id); + PMCLOG_EMIT32(pm->pm_event); + PMCLOG_EMIT32(pm->pm_flags); + ps = pmc_soft_ev_acquire(pm->pm_event); + if (ps != NULL) + PMCLOG_EMITSTRING(ps->ps_ev.pm_ev_name,PMC_NAME_MAX); + else + PMCLOG_EMITNULLSTRING(PMC_NAME_MAX); + pmc_soft_ev_release(ps); + PMCLOG_DESPATCH(po); + } else { + PMCLOG_RESERVE(po, PMCALLOCATE, + sizeof(struct pmclog_pmcallocate)); + PMCLOG_EMIT32(pm->pm_id); + PMCLOG_EMIT32(pm->pm_event); + PMCLOG_EMIT32(pm->pm_flags); + PMCLOG_DESPATCH(po); + } } void |
