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Patch in this message | | | From | "Yan, Zheng" <> | Subject | [PATCH 06/15] perf, core: PMU specific data for perf task context | Date | Wed, 11 Dec 2013 15:10:51 +0800 |
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From: "Yan, Zheng" <zheng.z.yan@intel.com>
allow allocating PMU specific data for perf task context
Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> --- include/linux/perf_event.h | 5 +++++ kernel/events/core.c | 19 ++++++++++++++++++- 2 files changed, 23 insertions(+), 1 deletion(-)
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 96cb88b..147f9d3 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -252,6 +252,10 @@ struct pmu { */ void (*sched_task) (struct perf_event_context *ctx, bool sched_in); + /* + * PMU specific data size + */ + size_t task_ctx_size; }; /** @@ -496,6 +500,7 @@ struct perf_event_context { int pin_count; int nr_cgroups; /* cgroup evts */ int nr_branch_stack; /* branch_stack evt */ + void *task_ctx_data; /* pmu specific data */ struct rcu_head rcu_head; }; diff --git a/kernel/events/core.c b/kernel/events/core.c index c281265..6499dae 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -882,6 +882,15 @@ static void get_ctx(struct perf_event_context *ctx) WARN_ON(!atomic_inc_not_zero(&ctx->refcount)); } +static void free_ctx(struct rcu_head *head) +{ + struct perf_event_context *ctx; + + ctx = container_of(head, struct perf_event_context, rcu_head); + kfree(ctx->task_ctx_data); + kfree(ctx); +} + static void put_ctx(struct perf_event_context *ctx) { if (atomic_dec_and_test(&ctx->refcount)) { @@ -889,7 +898,7 @@ static void put_ctx(struct perf_event_context *ctx) put_ctx(ctx->parent_ctx); if (ctx->task) put_task_struct(ctx->task); - kfree_rcu(ctx, rcu_head); + call_rcu(&ctx->rcu_head, free_ctx); } } @@ -3025,6 +3034,14 @@ alloc_perf_context(struct pmu *pmu, struct task_struct *task) if (!ctx) return NULL; + if (task && pmu->task_ctx_size > 0) { + ctx->task_ctx_data = kzalloc(pmu->task_ctx_size, GFP_KERNEL); + if (!ctx->task_ctx_data) { + kfree(ctx); + return NULL; + } + } + __perf_event_init_context(ctx); if (task) { ctx->task = task; -- 1.8.1.4
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