hung_task: Display every hung task warning
authorAaron Tomlin <atomlin@redhat.com>
Mon, 20 Jan 2014 17:34:13 +0000 (17:34 +0000)
committerIngo Molnar <mingo@kernel.org>
Sat, 25 Jan 2014 11:13:33 +0000 (12:13 +0100)
commit270750dbc18a71b23d660df110e433ff9616a2d4
tree9b0400fc3713bd02d31835e8d0315cfbd7ccd912
parent2397efb1bb17595b35f31abb40d95074ebc04f1b
hung_task: Display every hung task warning

When khungtaskd detects hung tasks, it prints out
backtraces from a number of those tasks.

Limiting the number of backtraces being printed
out can result in the user not seeing the information
necessary to debug the issue. The hung_task_warnings
sysctl controls this feature.

This patch makes it possible for hung_task_warnings
to accept a special value to print an unlimited
number of backtraces when khungtaskd detects hung
tasks.

The special value is -1. To use this value it is
necessary to change types from ulong to int.

Signed-off-by: Aaron Tomlin <atomlin@redhat.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: oleg@redhat.com
Link: http://lkml.kernel.org/r/1390239253-24030-3-git-send-email-atomlin@redhat.com
[ Build warning fix. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Documentation/sysctl/kernel.txt
include/linux/sched/sysctl.h
kernel/hung_task.c
kernel/sysctl.c