delayacct: track delays from IRQ/SOFTIRQ

[linux-2.6-block.git] / Documentation / accounting / delay-accounting.rst

diff --git a/Documentation/accounting/delay-accounting.rst b/Documentation/accounting/delay-accounting.rst
index 79f537c9f160b35b6cd83b1f9843318e2382c24f..f61c01fc376e76456e9f0f55a005a2ea52e11041 100644 (file)
--- a/Documentation/accounting/delay-accounting.rst
+++ b/Documentation/accounting/delay-accounting.rst
@@ -16,6 +16,7 @@ d) memory reclaim
 e) thrashing
 f) direct compact
 g) write-protect copy
+h) IRQ/SOFTIRQ
 
 and makes these statistics available to userspace through
 the taskstats interface.
@@ -49,7 +50,7 @@ this structure. See
 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, memory reclaim, thrash page
-cache, direct compact, write-protect copy etc.
+cache, direct compact, write-protect copy, IRQ/SOFTIRQ etc.
 
 Taking the difference of two successive readings of a given
 counter (say cpu_delay_total) for a task will give the delay
@@ -118,7 +119,9 @@ Get sum of delays, since system boot, for all pids with tgid 5::
                        0              0          0.000ms
        COMPACT         count    delay total  delay average
                        0              0          0.000ms
-   WPCOPY          count    delay total  delay average
+       WPCOPY          count    delay total  delay average
+                       0              0          0.000ms
+       IRQ             count    delay total  delay average
                        0              0          0.000ms
 
 Get IO accounting for pid 1, it works only with -p::