Commit b8147511 authored by wuchi's avatar wuchi Committed by Andrew Morton
Browse files

latencytop: use the last element of latency_record of system 

In account_global_scheduler_latency(), when we don't find the matching
latency_record we try to select one which is unused in
latency_record[MAXLR], but the condition will skip the last one.

if (i >= MAXLR-1)

Fix that.

Link: https://lkml.kernel.org/r/20220903135233.5225-1-wuchi.zero@gmail.com


Signed-off-by: default avatarwuchi <wuchi.zero@gmail.com>
Reviewed-by: default avatarAndrew Morton <akpm@linux-foudation.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent bfca3dd3

kernel/latencytop.c

+2 −2
Original line number Diff line number Diff line
@@ -112,7 +112,7 @@ static void __sched 
account_global_scheduler_latency(struct task_struct *tsk,

				 struct latency_record *lat)

{

	int firstnonnull = MAXLR + 1;

	int firstnonnull = MAXLR;

	int i;



	/* skip kernel threads for now */
@@ -150,7 +150,7 @@ account_global_scheduler_latency(struct task_struct *tsk, 
	}



	i = firstnonnull;

	if (i >= MAXLR - 1)

	if (i >= MAXLR)

		return;



	/* Allocted a new one: */