On Mon, May 10, 2021 at 02:05:13PM +0200, Peter Zijlstra wrote: > > Just like sched_schedstats, allow runtime enabling (and disabling) of > delayacct. This is useful if one forgot to add the delayacct boot time > option. > > Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> > --- > Documentation/accounting/delay-accounting.rst | 6 ++-- > kernel/delayacct.c | 36 ++++++++++++++++++++++++-- > kernel/sysctl.c | 12 ++++++++ > 3 files changed, 50 insertions(+), 4 deletions(-) > Update sysctl/kernel.rst? diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst index 1d56a6b73a4e..5d9193bd8d27 100644 --- a/Documentation/admin-guide/sysctl/kernel.rst +++ b/Documentation/admin-guide/sysctl/kernel.rst @@ -1087,6 +1087,13 @@ Model available). If your platform happens to meet the requirements for EAS but you do not want to use it, change this value to 0. +sched_delayacct +=============== + +Enables/disables task delay accounting (see +:doc:`accounting/delay-accounting.rst`). Enabling this feature incurs +a small amount of overhead in the scheduler but is useful for debugging +and performance tuning. It is required by some tools such as iotop. sched_schedstats ================ -- Mel Gorman SUSE Labs
