From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756501Ab3KLQ6c (ORCPT ); Tue, 12 Nov 2013 11:58:32 -0500 Received: from mail-wi0-f176.google.com ([209.85.212.176]:48063 "EHLO mail-wi0-f176.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756429Ab3KLQ6U (ORCPT ); Tue, 12 Nov 2013 11:58:20 -0500 From: Stephane Eranian To: linux-kernel@vger.kernel.org Cc: peterz@infradead.org, mingo@elte.hu, ak@linux.intel.com, acme@redhat.com, jolsa@redhat.com, zheng.z.yan@intel.com, bp@alien8.de, maria.n.dimakopoulou@gmail.com Subject: [PATCH v7 1/4] perf: add active_entry list head to struct perf_event Date: Tue, 12 Nov 2013 17:58:48 +0100 Message-Id: <1384275531-10892-2-git-send-email-eranian@google.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1384275531-10892-1-git-send-email-eranian@google.com> References: <1384275531-10892-1-git-send-email-eranian@google.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch adds a new field to the struct perf_event. It is intended to be used to chain events which are active (enabled). It helps in the hardware layer for PMUs which do not have actual counter restrictions, i.e., free running read-only counters. Active events are chained as opposed to being tracked via the counter they use. To save space we use a union with hlist_entry as both are mutually exclusive (suggested by Jiri Olsa). Signed-off-by: Stephane Eranian --- include/linux/perf_event.h | 5 ++++- kernel/events/core.c | 1 + 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 2e069d1..8f4a70f 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -319,7 +319,10 @@ struct perf_event { */ struct list_head migrate_entry; - struct hlist_node hlist_entry; + union { + struct hlist_node hlist_entry; + struct list_head active_entry; + }; int nr_siblings; int group_flags; struct perf_event *group_leader; diff --git a/kernel/events/core.c b/kernel/events/core.c index 4dc078d..90dca5c 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -6663,6 +6663,7 @@ perf_event_alloc(struct perf_event_attr *attr, int cpu, INIT_LIST_HEAD(&event->event_entry); INIT_LIST_HEAD(&event->sibling_list); INIT_LIST_HEAD(&event->rb_entry); + INIT_LIST_HEAD(&event->active_entry); init_waitqueue_head(&event->waitq); init_irq_work(&event->pending, perf_pending_event); -- 1.7.9.5