From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755883Ab3JGKfG (ORCPT ); Mon, 7 Oct 2013 06:35:06 -0400 Received: from cantor2.suse.de ([195.135.220.15]:39983 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755376Ab3JGKaX (ORCPT ); Mon, 7 Oct 2013 06:30:23 -0400 From: Mel Gorman To: Peter Zijlstra , Rik van Riel Cc: Srikar Dronamraju , Ingo Molnar , Andrea Arcangeli , Johannes Weiner , Linux-MM , LKML , Mel Gorman Subject: [PATCH 44/63] sched: numa: Report a NUMA task group ID Date: Mon, 7 Oct 2013 11:29:22 +0100 Message-Id: <1381141781-10992-45-git-send-email-mgorman@suse.de> X-Mailer: git-send-email 1.8.4 In-Reply-To: <1381141781-10992-1-git-send-email-mgorman@suse.de> References: <1381141781-10992-1-git-send-email-mgorman@suse.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org It is desirable to model from userspace how the scheduler groups tasks over time. This patch adds an ID to the numa_group and reports it via /proc/PID/status. Signed-off-by: Mel Gorman --- fs/proc/array.c | 2 ++ include/linux/sched.h | 5 +++++ kernel/sched/fair.c | 7 +++++++ 3 files changed, 14 insertions(+) diff --git a/fs/proc/array.c b/fs/proc/array.c index cbd0f1b..1bd2077 100644 --- a/fs/proc/array.c +++ b/fs/proc/array.c @@ -183,6 +183,7 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns, seq_printf(m, "State:\t%s\n" "Tgid:\t%d\n" + "Ngid:\t%d\n" "Pid:\t%d\n" "PPid:\t%d\n" "TracerPid:\t%d\n" @@ -190,6 +191,7 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns, "Gid:\t%d\t%d\t%d\t%d\n", get_task_state(p), task_tgid_nr_ns(p, ns), + task_numa_group_id(p), pid_nr_ns(pid, ns), ppid, tpid, from_kuid_munged(user_ns, cred->uid), diff --git a/include/linux/sched.h b/include/linux/sched.h index 505d4ac..1618417 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1442,12 +1442,17 @@ struct task_struct { #ifdef CONFIG_NUMA_BALANCING extern void task_numa_fault(int last_node, int node, int pages, bool migrated); +extern pid_t task_numa_group_id(struct task_struct *p); extern void set_numabalancing_state(bool enabled); #else static inline void task_numa_fault(int last_node, int node, int pages, bool migrated) { } +static inline pid_t task_numa_group_id(struct task_struct *p) +{ + return 0; +} static inline void set_numabalancing_state(bool enabled) { } diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 339b1e1..2f60f05 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -893,12 +893,18 @@ struct numa_group { spinlock_t lock; /* nr_tasks, tasks */ int nr_tasks; + pid_t gid; struct list_head task_list; struct rcu_head rcu; atomic_long_t faults[0]; }; +pid_t task_numa_group_id(struct task_struct *p) +{ + return p->numa_group ? p->numa_group->gid : 0; +} + static inline int task_faults_idx(int nid, int priv) { return 2 * nid + priv; @@ -1265,6 +1271,7 @@ static void task_numa_group(struct task_struct *p, int cpupid) atomic_set(&grp->refcount, 1); spin_lock_init(&grp->lock); INIT_LIST_HEAD(&grp->task_list); + grp->gid = p->pid; for (i = 0; i < 2*nr_node_ids; i++) atomic_long_set(&grp->faults[i], p->numa_faults[i]); -- 1.8.4