[RFC PATCH v4 0/2] hung_task: Display every hung task warning

From: atomlin
Date: Mon Jan 20 2014 - 12:35:37 EST

From: Aaron Tomlin <atomlin@xxxxxxxxxx>

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 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(-)


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