[PATCH] delay accounting: temporarily enable by default
Enable delay accounting by default so that feature gets coverage testing
without requiring special measures.
Earlier, it was off by default and had to be enabled via a boot time param.
This patch reverses the default behaviour to improve coverage testing. It
can be removed late in the kernel development cycle if its believed users
shouldn't have to incur any cost if they don't want delay accounting. Or
it can be retained forever if the utility of the stats is deemed common
enough to warrant keeping the feature on.
Signed-off-by: Shailabh Nagar <nagar@watson.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/Documentation/accounting/delay-accounting.txt b/Documentation/accounting/delay-accounting.txt
index be215e5..1443cd7 100644
--- a/Documentation/accounting/delay-accounting.txt
+++ b/Documentation/accounting/delay-accounting.txt
@@ -64,11 +64,13 @@
CONFIG_TASK_DELAY_ACCT=y
CONFIG_TASKSTATS=y
-Enable the accounting at boot time by adding
-the following to the kernel boot options
- delayacct
+Delay accounting is enabled by default at boot up.
+To disable, add
+ nodelayacct
+to the kernel boot options. The rest of the instructions
+below assume this has not been done.
-and after the system has booted up, use a utility
+After the system has booted up, use a utility
similar to getdelays.c to access the delays
seen by a given task or a task group (tgid).
The utility also allows a given command to be