[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>

2 files changed, 8 insertions, 6 deletions

diff --git a/Documentation/accounting/delay-accounting.txt b/Documentation/accounting/delay-accounting.txt
index be215e58423b..1443cd71d263 100644
--- a/Documentation/accounting/delay-accounting.txt
+++ b/Documentation/accounting/delay-accounting.txt
@@ -64,11 +64,13 @@ Compile the kernel with
         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
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index e11f7728ec6f..b50595a0550f 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -448,8 +448,6 @@ running once the system is up.
                         Format: <area>[,<node>]
                         See also Documentation/networking/decnet.txt.
 
-        delayacct       [KNL] Enable per-task delay accounting
-
         dhash_entries=  [KNL]
                         Set number of hash buckets for dentry cache.
 
@@ -1031,6 +1029,8 @@ running once the system is up.
 
         nocache         [ARM]
 
+        nodelayacct     [KNL] Disable per-task delay accounting
+
         nodisconnect    [HW,SCSI,M68K] Disables SCSI disconnects.
 
         noexec          [IA-64]