diff options
author | Maxim Uvarov <muvarov@ru.mvista.com> | 2007-07-15 23:40:48 -0700 |
---|---|---|
committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-16 09:05:46 -0700 |
commit | b663a79c191508f27cd885224b592a878c0ba0f6 (patch) | |
tree | 270a0472bf1fb0c7323ecb60ec68e40d02dcb1b4 /Documentation/accounting/taskstats-struct.txt | |
parent | a6c15c2b0fbfd5c0a84f5f0e1e3f20f85d2b8692 (diff) | |
download | kernel_samsung_smdk4412-b663a79c191508f27cd885224b592a878c0ba0f6.zip kernel_samsung_smdk4412-b663a79c191508f27cd885224b592a878c0ba0f6.tar.gz kernel_samsung_smdk4412-b663a79c191508f27cd885224b592a878c0ba0f6.tar.bz2 |
taskstats: add context-switch counters
Make available to the user the following task and process performance
statistics:
* Involuntary Context Switches (task_struct->nivcsw)
* Voluntary Context Switches (task_struct->nvcsw)
Statistics information is available from:
1. taskstats interface (Documentation/accounting/)
2. /proc/PID/status (task only).
This data is useful for detecting hyperactivity patterns between processes.
[akpm@linux-foundation.org: cleanup]
Signed-off-by: Maxim Uvarov <muvarov@ru.mvista.com>
Cc: Shailabh Nagar <nagar@watson.ibm.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Jay Lan <jlan@engr.sgi.com>
Cc: Jonathan Lim <jlim@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/accounting/taskstats-struct.txt')
-rw-r--r-- | Documentation/accounting/taskstats-struct.txt | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/accounting/taskstats-struct.txt b/Documentation/accounting/taskstats-struct.txt index 661c797..8aa7529 100644 --- a/Documentation/accounting/taskstats-struct.txt +++ b/Documentation/accounting/taskstats-struct.txt @@ -22,6 +22,8 @@ There are three different groups of fields in the struct taskstats: /* Extended accounting fields end */ Their values are collected if CONFIG_TASK_XACCT is set. +4) Per-task and per-thread context switch count statistics + Future extension should add fields to the end of the taskstats struct, and should not change the relative position of each field within the struct. @@ -158,4 +160,8 @@ struct taskstats { /* Extended accounting fields end */ +4) Per-task and per-thread statistics + __u64 nvcsw; /* Context voluntary switch counter */ + __u64 nivcsw; /* Context involuntary switch counter */ + } |