From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755145AbaF3IvZ (ORCPT ); Mon, 30 Jun 2014 04:51:25 -0400 Received: from mga09.intel.com ([134.134.136.24]:43142 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755009AbaF3IvX (ORCPT ); Mon, 30 Jun 2014 04:51:23 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.01,573,1400050800"; d="scan'208";a="536451049" 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 V4 08/16] perf, x86: allocate space for storing LBR stack Date: Mon, 30 Jun 2014 16:50:45 +0800 Message-Id: <1404118253-19532-9-git-send-email-zheng.z.yan@intel.com> X-Mailer: git-send-email 1.9.0 In-Reply-To: <1404118253-19532-1-git-send-email-zheng.z.yan@intel.com> References: <1404118253-19532-1-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 | 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 8868e9b..2008c2a 100644 --- a/arch/x86/kernel/cpu/perf_event.c +++ b/arch/x86/kernel/cpu/perf_event.c @@ -1907,6 +1907,7 @@ 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, -- 1.9.0