linux-kernel - [tip: sched/core] sched/debug: Remove mpol_get/put and task_lock/unlock from sched_show

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Date:   Fri, 28 Jan 2022 07:40:20 -0000
From:   "tip-bot2 for Bharata B Rao" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Bharata B Rao <bharata@....com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        Mel Gorman <mgorman@...e.de>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: sched/core] sched/debug: Remove mpol_get/put and
 task_lock/unlock from sched_show_numa

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     28c988c3ec29db74a1dda631b18785958d57df4f
Gitweb:        https://git.kernel.org/tip/28c988c3ec29db74a1dda631b18785958d57df4f
Author:        Bharata B Rao <bharata@....com>
AuthorDate:    Tue, 18 Jan 2022 10:35:15 +05:30
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Thu, 27 Jan 2022 12:57:18 +01:00

sched/debug: Remove mpol_get/put and task_lock/unlock from sched_show_numa

The older format of /proc/pid/sched printed home node info which
required the mempolicy and task lock around mpol_get(). However
the format has changed since then and there is no need for
sched_show_numa() any more to have mempolicy argument,
asssociated mpol_get/put and task_lock/unlock. Remove them.

Fixes: 397f2378f1361 ("sched/numa: Fix numa balancing stats in /proc/pid/sched")
Signed-off-by: Bharata B Rao <bharata@....com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Acked-by: Mel Gorman <mgorman@...e.de>
Link: https://lore.kernel.org/r/20220118050515.2973-1-bharata@amd.com
---
 kernel/sched/debug.c | 10 ----------
 1 file changed, 10 deletions(-)

diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index aa29211..102d6f7 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -931,25 +931,15 @@ void print_numa_stats(struct seq_file *m, int node, unsigned long tsf,
 static void sched_show_numa(struct task_struct *p, struct seq_file *m)
 {
 #ifdef CONFIG_NUMA_BALANCING
-	struct mempolicy *pol;
-
 	if (p->mm)
 		P(mm->numa_scan_seq);
 
-	task_lock(p);
-	pol = p->mempolicy;
-	if (pol && !(pol->flags & MPOL_F_MORON))
-		pol = NULL;
-	mpol_get(pol);
-	task_unlock(p);
-
 	P(numa_pages_migrated);
 	P(numa_preferred_nid);
 	P(total_numa_faults);
 	SEQ_printf(m, "current_node=%d, numa_group_id=%d\n",
 			task_node(p), task_numa_group_id(p));
 	show_numa_stats(p, m);
-	mpol_put(pol);
 #endif
 }