delayacct-blkio-collect.patch
Collect per-task block I/O delay statistics.
Unlike earlier iterations of the delay accounting
patches, now delays are only collected for the actual
I/O waits rather than try and cover the delays seen in
I/O submission paths.
Signed-off-by: Shailabh Nagar <[email protected]>
kernel/sched.c | 5 +++++
1 files changed, 5 insertions(+)
Index: linux-2.6.16-rc5/kernel/sched.c
===================================================================
--- linux-2.6.16-rc5.orig/kernel/sched.c 2006-03-11 07:41:32.000000000 -0500
+++ linux-2.6.16-rc5/kernel/sched.c 2006-03-11 07:41:39.000000000 -0500
@@ -49,6 +49,7 @@
#include <linux/syscalls.h>
#include <linux/times.h>
#include <linux/acct.h>
+#include <linux/delayacct.h>
#include <asm/tlb.h>
#include <asm/unistd.h>
@@ -4117,9 +4118,11 @@ void __sched io_schedule(void)
{
struct runqueue *rq = &per_cpu(runqueues, raw_smp_processor_id());
+ delayacct_blkio_start();
atomic_inc(&rq->nr_iowait);
schedule();
atomic_dec(&rq->nr_iowait);
+ delayacct_blkio_end();
}
EXPORT_SYMBOL(io_schedule);
@@ -4129,9 +4132,11 @@ long __sched io_schedule_timeout(long ti
struct runqueue *rq = &per_cpu(runqueues, raw_smp_processor_id());
long ret;
+ delayacct_blkio_start();
atomic_inc(&rq->nr_iowait);
ret = schedule_timeout(timeout);
atomic_dec(&rq->nr_iowait);
+ delayacct_blkio_end();
return ret;
}
-
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