Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932186AbaKEDMp (ORCPT ); Tue, 4 Nov 2014 22:12:45 -0500 Received: from mga11.intel.com ([192.55.52.93]:27608 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753236AbaKEDKW (ORCPT ); Tue, 4 Nov 2014 22:10:22 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.07,317,1413270000"; d="scan'208";a="617286990" From: Kan Liang To: a.p.zijlstra@chello.nl, eranian@google.com Cc: linux-kernel@vger.kernel.org, mingo@redhat.com, paulus@samba.org, acme@kernel.org, jolsa@redhat.com, ak@linux.intel.com, Kan Liang Subject: [PATCH V7 07/17] perf, x86: allocate space for storing LBR stack Date: Tue, 4 Nov 2014 21:56:03 -0500 Message-Id: <1415156173-10035-8-git-send-email-kan.liang@intel.com> X-Mailer: git-send-email 1.8.3.2 In-Reply-To: <1415156173-10035-1-git-send-email-kan.liang@intel.com> References: <1415156173-10035-1-git-send-email-kan.liang@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Yan, Zheng 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 Signed-off-by: Kan Liang 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 e37adf0..1fd9492 100644 --- a/arch/x86/kernel/cpu/perf_event.c +++ b/arch/x86/kernel/cpu/perf_event.c @@ -428,6 +428,9 @@ 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) @@ -1912,6 +1915,7 @@ 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 13464e4..b4568e5 100644 --- a/arch/x86/kernel/cpu/perf_event.h +++ b/arch/x86/kernel/cpu/perf_event.h @@ -510,6 +510,13 @@ 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, -- 1.8.3.2 -- 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/