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Diffstat (limited to 'Documentation/accounting/delay-accounting.rst')
| -rw-r--r-- | Documentation/accounting/delay-accounting.rst | 21 |
1 files changed, 12 insertions, 9 deletions
diff --git a/Documentation/accounting/delay-accounting.rst b/Documentation/accounting/delay-accounting.rst index 241d1a87f2cd..f61c01fc376e 100644 --- a/Documentation/accounting/delay-accounting.rst +++ b/Documentation/accounting/delay-accounting.rst @@ -13,9 +13,10 @@ 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 -e) thrashing page cache +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 @@ -109,17 +110,19 @@ Get sum of delays, since system boot, for all pids with tgid 5:: CPU count real total virtual total delay total delay average 8 7000000 6872122 3382277 0.423ms IO count delay total delay average - 0 0 0ms + 0 0 0.000ms SWAP count delay total delay average - 0 0 0ms + 0 0 0.000ms RECLAIM count delay total delay average - 0 0 0ms + 0 0 0.000ms THRASHING count delay total delay average - 0 0 0ms + 0 0 0.000ms COMPACT count delay total delay average - 0 0 0ms - WPCOPY count delay total delay average - 0 0 0ms + 0 0 0.000ms + 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:: |