linux-kernel - [RFC PATCH v5 0/2] hung_task: Display every hung task warning

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Date:	Thu, 23 Jan 2014 10:56:01 +0000
From:	Aaron Tomlin <atomlin@...hat.com>
To:	mingo@...nel.org
Cc:	linux-kernel@...r.kernel.org, rientjes@...gle.com,
	mingo@...hat.com, oleg@...hat.com, riel@...hat.com,
	akpm@...ux-foundation.org, atomlin@...hat.com
Subject: [RFC PATCH v5 0/2] 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.

Rebased against v3.13-rc8.

Changes since v4:
 - Improve the documentation on hung_task_warnings

Changes since v3:
 - Simplify the commit message (Rik van Riel and David Rientjes)
 - Document hung_task_* sysctl parameters (David Rientjes)

Aaron Tomlin (2):
  sysctl: Make neg_one a standard constraint
  hung_task: Display every hung task warning

 Documentation/sysctl/kernel.txt | 42 +++++++++++++++++++++++++++++++++++++++++
 include/linux/sched/sysctl.h    |  2 +-
 kernel/hung_task.c              |  6 ++++--
 kernel/sysctl.c                 |  6 ++++--
 4 files changed, 51 insertions(+), 5 deletions(-)

-- 
1.8.4.2

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