diff options
| author | Tejun Heo <tj@kernel.org> | 2011-05-24 09:59:36 +0200 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2011-05-24 09:59:36 +0200 |
| commit | 6988f20fe04e9ef3aea488cb8ab57fbeb78e12f0 (patch) | |
| tree | c9d7fc50a2e2147a5ca07e3096e7eeb916ad2da9 /kernel/perf_event.c | |
| parent | 0415b00d175e0d8945e6785aad21b5f157976ce0 (diff) | |
| parent | 6ea0c34dac89611126455537552cffe6c7e832ad (diff) | |
Merge branch 'fixes-2.6.39' into for-2.6.40
Diffstat (limited to 'kernel/perf_event.c')
| -rw-r--r-- | kernel/perf_event.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/kernel/perf_event.c b/kernel/perf_event.c index 3472bb1a070c..c75925c4d1e2 100644 --- a/kernel/perf_event.c +++ b/kernel/perf_event.c @@ -145,7 +145,8 @@ static struct srcu_struct pmus_srcu; */ int sysctl_perf_event_paranoid __read_mostly = 1; -int sysctl_perf_event_mlock __read_mostly = 512; /* 'free' kb per user */ +/* Minimum for 128 pages + 1 for the user control page */ +int sysctl_perf_event_mlock __read_mostly = 516; /* 'free' kb per user */ /* * max perf event sample rate @@ -941,6 +942,7 @@ static void perf_group_attach(struct perf_event *event) static void list_del_event(struct perf_event *event, struct perf_event_context *ctx) { + struct perf_cpu_context *cpuctx; /* * We can have double detach due to exit/hot-unplug + close. */ @@ -949,8 +951,17 @@ list_del_event(struct perf_event *event, struct perf_event_context *ctx) event->attach_state &= ~PERF_ATTACH_CONTEXT; - if (is_cgroup_event(event)) + if (is_cgroup_event(event)) { ctx->nr_cgroups--; + cpuctx = __get_cpu_context(ctx); + /* + * if there are no more cgroup events + * then cler cgrp to avoid stale pointer + * in update_cgrp_time_from_cpuctx() + */ + if (!ctx->nr_cgroups) + cpuctx->cgrp = NULL; + } ctx->nr_events--; if (event->attr.inherit_stat) |