From: Andrew Morton <[email protected]>
Deliver IO accounting via taskstats.
Cc: Jay Lan <[email protected]>
Cc: Shailabh Nagar <[email protected]>
Cc: Balbir Singh <[email protected]>
Cc: Chris Sturtivant <[email protected]>
Cc: Tony Ernst <[email protected]>
Cc: Guillaume Thouvenin <[email protected]>
Cc: David Wright <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---
include/linux/taskstats.h | 8 +++++++-
kernel/tsacct.c | 9 +++++++++
2 files changed, 16 insertions(+), 1 deletion(-)
diff -puN include/linux/taskstats.h~io-accounting-via-taskstats include/linux/taskstats.h
--- a/include/linux/taskstats.h~io-accounting-via-taskstats
+++ a/include/linux/taskstats.h
@@ -31,7 +31,7 @@
*/
-#define TASKSTATS_VERSION 2
+#define TASKSTATS_VERSION 3
#define TS_COMM_LEN 32 /* should be >= TASK_COMM_LEN
* in linux/sched.h */
@@ -140,6 +140,12 @@ struct taskstats {
__u64 read_syscalls; /* read syscalls */
__u64 write_syscalls; /* write syscalls */
/* Extended accounting fields end */
+
+#define TASKSTATS_HAS_IO_ACCOUNTING
+ /* Per-task storage I/O accounting starts */
+ __u64 read_bytes; /* bytes of read I/O */
+ __u64 write_bytes; /* bytes of write I/O */
+ __u64 cancelled_write_bytes; /* bytes of cancelled write I/O */
};
diff -puN kernel/tsacct.c~io-accounting-via-taskstats kernel/tsacct.c
--- a/kernel/tsacct.c~io-accounting-via-taskstats
+++ a/kernel/tsacct.c
@@ -96,6 +96,15 @@ void xacct_add_tsk(struct taskstats *sta
stats->write_char = p->wchar;
stats->read_syscalls = p->syscr;
stats->write_syscalls = p->syscw;
+#ifdef CONFIG_TASK_IO_ACCOUNTING
+ stats->read_bytes = p->ioac.read_bytes;
+ stats->write_bytes = p->ioac.write_bytes;
+ stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes;
+#else
+ stats->read_bytes = 0;
+ stats->write_bytes = 0;
+ stats->cancelled_write_bytes = 0;
+#endif
}
#undef KB
#undef MB
_
-
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