Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752354AbaGGGby (ORCPT ); Mon, 7 Jul 2014 02:31:54 -0400 Received: from mga09.intel.com ([134.134.136.24]:36667 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751858AbaGGG3F (ORCPT ); Mon, 7 Jul 2014 02:29:05 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.01,616,1400050800"; d="scan'208";a="539565542" 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 v5 07/16] perf, x86: allocate space for storing LBR stack Date: Mon, 7 Jul 2014 14:28:36 +0800 Message-Id: <1404714527-18603-8-git-send-email-zheng.z.yan@intel.com> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1404714527-18603-1-git-send-email-zheng.z.yan@intel.com> References: <1404714527-18603-1-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 When the LBR call stack is enabled, it is necessary to save/restore the LBR stack on context switch. We can use pmu specific data to store LBR stack when task is scheduled out. This patch adds code that allocates the pmu specific data. Signed-off-by: Yan, Zheng Reviewed-by: Stephane Eranian --- arch/x86/kernel/cpu/perf_event.c | 4 ++++ arch/x86/kernel/cpu/perf_event.h | 7 +++++++ 2 files changed, 11 insertions(+) diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c index 8868e9b..5abbb8a 100644 --- a/arch/x86/kernel/cpu/perf_event.c +++ b/arch/x86/kernel/cpu/perf_event.c @@ -423,6 +423,9 @@ int x86_pmu_hw_config(struct perf_event *event) } } + if (event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_CALL_STACK) + event->attach_state |= PERF_ATTACH_TASK_DATA; + /* * Generate PMC IRQs: * (keep 'enabled' bit clear for now) @@ -1907,6 +1910,7 @@ 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), }; void arch_perf_update_userpage(struct perf_event_mmap_page *userpg, u64 now) diff --git a/arch/x86/kernel/cpu/perf_event.h b/arch/x86/kernel/cpu/perf_event.h index cc25819..b0eabca 100644 --- a/arch/x86/kernel/cpu/perf_event.h +++ b/arch/x86/kernel/cpu/perf_event.h @@ -472,6 +472,13 @@ struct x86_pmu { struct perf_guest_switch_msr *(*guest_get_msrs)(int *nr); }; +struct x86_perf_task_context { + u64 lbr_from[MAX_LBR_ENTRIES]; + u64 lbr_to[MAX_LBR_ENTRIES]; + int lbr_callstack_users; + int lbr_stack_state; +}; + enum { PERF_SAMPLE_BRANCH_CALL_STACK_SHIFT = PERF_SAMPLE_BRANCH_MAX_SHIFT, PERF_SAMPLE_BRANCH_SELECT_MAP_SIZE, -- 1.9.3 -- 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/