Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752224AbaACFvB (ORCPT ); Fri, 3 Jan 2014 00:51:01 -0500 Received: from mga01.intel.com ([192.55.52.88]:47972 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751385AbaACFs0 (ORCPT ); Fri, 3 Jan 2014 00:48:26 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.95,595,1384329600"; d="scan'208";a="459449340" From: "Yan, Zheng" To: linux-kernel@vger.kernel.org Cc: a.p.zijlstra@chello.nl, mingo@kernel.org, acme@infradead.org, eranian@google.com, andi@firstfloor.org, "Yan, Zheng" Subject: [PATCH 05/14] perf, core: allow pmu specific data for perf task context Date: Fri, 3 Jan 2014 13:48:02 +0800 Message-Id: <1388728091-18564-6-git-send-email-zheng.z.yan@intel.com> X-Mailer: git-send-email 1.8.4.2 In-Reply-To: <1388728091-18564-1-git-send-email-zheng.z.yan@intel.com> References: <1388728091-18564-1-git-send-email-zheng.z.yan@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2277 Lines: 83 Later patches will use pmu specific data to save LBR stack. Signed-off-by: Yan, Zheng --- 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 aba4d6d..b6650ab 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -883,6 +883,15 @@ 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)) { @@ -890,7 +899,7 @@ 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); } } @@ -3020,6 +3029,14 @@ 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; -- 1.8.4.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/