linux-kernel - [PATCH 16/21] perf/x86: Remove task_ctx

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Date:   Fri, 19 Jun 2020 07:04:04 -0700
From:   kan.liang@...ux.intel.com
To:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        tglx@...utronix.de, bp@...en8.de, x86@...nel.org,
        linux-kernel@...r.kernel.org
Cc:     mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        jolsa@...hat.com, namhyung@...nel.org, dave.hansen@...el.com,
        yu-cheng.yu@...el.com, bigeasy@...utronix.de, gorcunov@...il.com,
        hpa@...or.com, alexey.budankov@...ux.intel.com, eranian@...gle.com,
        ak@...ux.intel.com, like.xu@...ux.intel.com,
        yao.jin@...ux.intel.com, Kan Liang <kan.liang@...ux.intel.com>
Subject: [PATCH 16/21] perf/x86: Remove task_ctx_size

From: Kan Liang <kan.liang@...ux.intel.com>

A new kmem_cache method has replaced the kzalloc() to allocate the PMU
specific data. The task_ctx_size is not required anymore.

Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
---
 arch/x86/events/core.c      | 1 -
 arch/x86/events/intel/lbr.c | 1 -
 include/linux/perf_event.h  | 4 ----
 kernel/events/core.c        | 4 +---
 4 files changed, 1 insertion(+), 9 deletions(-)

diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index a619763..aeb6e6d 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -2364,7 +2364,6 @@ static struct pmu pmu = {
 
 	.event_idx		= x86_pmu_event_idx,
 	.sched_task		= x86_pmu_sched_task,
-	.task_ctx_size          = sizeof(struct x86_perf_task_context),
 	.swap_task_ctx		= x86_pmu_swap_task_ctx,
 	.check_period		= x86_pmu_check_period,
 
diff --git a/arch/x86/events/intel/lbr.c b/arch/x86/events/intel/lbr.c
index 28f0d41..4060d3a 100644
--- a/arch/x86/events/intel/lbr.c
+++ b/arch/x86/events/intel/lbr.c
@@ -1662,7 +1662,6 @@ void __init intel_pmu_arch_lbr_init(void)
 
 	size = sizeof(struct x86_perf_task_context_arch_lbr) +
 	       lbr_nr * sizeof(struct x86_perf_arch_lbr_entry);
-	x86_get_pmu()->task_ctx_size = size;
 	x86_get_pmu()->task_ctx_cache = create_lbr_kmem_cache(size, 0);
 
 	x86_pmu.lbr_from = MSR_ARCH_LBR_FROM_0;
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index ef6440f..dd6f3a8 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -419,10 +419,6 @@ struct pmu {
 	 */
 	void (*sched_task)		(struct perf_event_context *ctx,
 					bool sched_in);
-	/*
-	 * PMU specific data size
-	 */
-	size_t				task_ctx_size;
 
 	/*
 	 * Kmem cache of PMU specific data
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 165b79b..9800e99 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -1239,15 +1239,13 @@ static void *alloc_task_ctx_data(struct pmu *pmu)
 	if (pmu->task_ctx_cache)
 		return kmem_cache_zalloc(pmu->task_ctx_cache, GFP_KERNEL);
 
-	return kzalloc(pmu->task_ctx_size, GFP_KERNEL);
+	return NULL;
 }
 
 static void free_task_ctx_data(struct pmu *pmu, void *task_ctx_data)
 {
 	if (pmu->task_ctx_cache && task_ctx_data)
 		kmem_cache_free(pmu->task_ctx_cache, task_ctx_data);
-	else
-		kfree(task_ctx_data);
 }
 
 static void free_ctx(struct rcu_head *head)
-- 
2.7.4