Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752141AbaACFui (ORCPT ); Fri, 3 Jan 2014 00:50:38 -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 S1751438AbaACFsb (ORCPT ); Fri, 3 Jan 2014 00:48:31 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.95,595,1384329600"; d="scan'208";a="459449365" 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 08/14] perf, x86: allocate space for storing LBR stack Date: Fri, 3 Jan 2014 13:48:05 +0800 Message-Id: <1388728091-18564-9-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: 1692 Lines: 49 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 --- arch/x86/kernel/cpu/perf_event.c | 1 + arch/x86/kernel/cpu/perf_event.h | 7 +++++++ 2 files changed, 8 insertions(+) diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c index 69e2095..2e43f1b 100644 --- a/arch/x86/kernel/cpu/perf_event.c +++ b/arch/x86/kernel/cpu/perf_event.c @@ -1879,6 +1879,7 @@ 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 3ef4b79..3ed9629 100644 --- a/arch/x86/kernel/cpu/perf_event.h +++ b/arch/x86/kernel/cpu/perf_event.h @@ -459,6 +459,13 @@ 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, -- 1.8.4.2 -- 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/