per-task-delay-accounting: update document and getdelays.c for memory reclaim
Keika Kobayashi [Fri, 25 Jul 2008 08:48:54 +0000 (01:48 -0700)]
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>

Documentation/accounting/delay-accounting.txt
Documentation/accounting/getdelays.c

index 1443cd7..8a12f07 100644 (file)
@@ -11,6 +11,7 @@ the delays experienced by a task while
 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 @@ this structure. See
      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 @@ CPU   count   real total      virtual total   delay total
        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 @@ CPU count   real total      virtual total   delay total
        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
index 40121b5..3f7755f 100644 (file)
@@ -196,14 +196,18 @@ void print_delayacct(struct taskstats *t)
               "      %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)