per-task-delay-accounting: update document and getdelays.c for memory reclaim
Update document and make getdelays.c show delay accounting for memory reclaim.
For making a distinction between "swapping in pages" and "memory reclaim"
in getdelays.c, MEM is changed to SWAP.
Signed-off-by: Keika Kobayashi <kobayashi.kk@ncos.nec.co.jp>
Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/Documentation/accounting/delay-accounting.txt b/Documentation/accounting/delay-accounting.txt
index 1443cd7..8a12f07 100644
--- a/Documentation/accounting/delay-accounting.txt
+++ b/Documentation/accounting/delay-accounting.txt
@@ -11,6 +11,7 @@
a) waiting for a CPU (while being runnable)
b) completion of synchronous block I/O initiated by the task
c) swapping in pages
+d) memory reclaim
and makes these statistics available to userspace through
the taskstats interface.
@@ -41,7 +42,7 @@
include/linux/taskstats.h
for a description of the fields pertaining to delay accounting.
It will generally be in the form of counters returning the cumulative
-delay seen for cpu, sync block I/O, swapin etc.
+delay seen for cpu, sync block I/O, swapin, memory reclaim etc.
Taking the difference of two successive readings of a given
counter (say cpu_delay_total) for a task will give the delay
@@ -94,7 +95,9 @@
7876 92005750 100000000 24001500
IO count delay total
0 0
-MEM count delay total
+SWAP count delay total
+ 0 0
+RECLAIM count delay total
0 0
Get delays seen in executing a given simple command
@@ -108,5 +111,7 @@
6 4000250 4000000 0
IO count delay total
0 0
-MEM count delay total
+SWAP count delay total
+ 0 0
+RECLAIM count delay total
0 0
diff --git a/Documentation/accounting/getdelays.c b/Documentation/accounting/getdelays.c
index 40121b5..3f7755f 100644
--- a/Documentation/accounting/getdelays.c
+++ b/Documentation/accounting/getdelays.c
@@ -196,14 +196,18 @@
" %15llu%15llu%15llu%15llu\n"
"IO %15s%15s\n"
" %15llu%15llu\n"
- "MEM %15s%15s\n"
+ "SWAP %15s%15s\n"
+ " %15llu%15llu\n"
+ "RECLAIM %12s%15s\n"
" %15llu%15llu\n",
"count", "real total", "virtual total", "delay total",
t->cpu_count, t->cpu_run_real_total, t->cpu_run_virtual_total,
t->cpu_delay_total,
"count", "delay total",
t->blkio_count, t->blkio_delay_total,
- "count", "delay total", t->swapin_count, t->swapin_delay_total);
+ "count", "delay total", t->swapin_count, t->swapin_delay_total,
+ "count", "delay total",
+ t->freepages_count, t->freepages_delay_total);
}
void task_context_switch_counts(struct taskstats *t)