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mm-tracepoint: fix documentation and examples
We renamed the page-free mm tracepoints. Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org> Cc: Mel Gorman <mel@csn.ul.ie> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Reviewed-by: Minchan Kim <minchan.kim@gmail.com> Cc: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -93,14 +93,14 @@ By specifying the -a switch and analysing sleep, the system-wide events
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for a duration of time can be examined.
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$ perf stat -a \
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-e kmem:mm_page_alloc -e kmem:mm_page_free_direct \
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-e kmem:mm_pagevec_free \
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-e kmem:mm_page_alloc -e kmem:mm_page_free \
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-e kmem:mm_page_free_batched \
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sleep 10
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Performance counter stats for 'sleep 10':
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9630 kmem:mm_page_alloc
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2143 kmem:mm_page_free_direct
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7424 kmem:mm_pagevec_free
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2143 kmem:mm_page_free
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7424 kmem:mm_page_free_batched
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10.002577764 seconds time elapsed
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@ -119,15 +119,15 @@ basis using set_ftrace_pid.
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Events can be activated and tracked for the duration of a process on a local
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basis using PCL such as follows.
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$ perf stat -e kmem:mm_page_alloc -e kmem:mm_page_free_direct \
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-e kmem:mm_pagevec_free ./hackbench 10
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$ perf stat -e kmem:mm_page_alloc -e kmem:mm_page_free \
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-e kmem:mm_page_free_batched ./hackbench 10
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Time: 0.909
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Performance counter stats for './hackbench 10':
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17803 kmem:mm_page_alloc
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12398 kmem:mm_page_free_direct
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4827 kmem:mm_pagevec_free
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12398 kmem:mm_page_free
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4827 kmem:mm_page_free_batched
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0.973913387 seconds time elapsed
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@ -146,8 +146,8 @@ to know what the standard deviation is. By and large, this is left to the
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performance analyst to do it by hand. In the event that the discrete event
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occurrences are useful to the performance analyst, then perf can be used.
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$ perf stat --repeat 5 -e kmem:mm_page_alloc -e kmem:mm_page_free_direct
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-e kmem:mm_pagevec_free ./hackbench 10
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$ perf stat --repeat 5 -e kmem:mm_page_alloc -e kmem:mm_page_free
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-e kmem:mm_page_free_batched ./hackbench 10
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Time: 0.890
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Time: 0.895
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Time: 0.915
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@ -157,8 +157,8 @@ occurrences are useful to the performance analyst, then perf can be used.
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Performance counter stats for './hackbench 10' (5 runs):
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16630 kmem:mm_page_alloc ( +- 3.542% )
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11486 kmem:mm_page_free_direct ( +- 4.771% )
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4730 kmem:mm_pagevec_free ( +- 2.325% )
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11486 kmem:mm_page_free ( +- 4.771% )
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4730 kmem:mm_page_free_batched ( +- 2.325% )
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0.982653002 seconds time elapsed ( +- 1.448% )
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@ -168,15 +168,15 @@ aggregation of discrete events, then a script would need to be developed.
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Using --repeat, it is also possible to view how events are fluctuating over
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time on a system-wide basis using -a and sleep.
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$ perf stat -e kmem:mm_page_alloc -e kmem:mm_page_free_direct \
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-e kmem:mm_pagevec_free \
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$ perf stat -e kmem:mm_page_alloc -e kmem:mm_page_free \
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-e kmem:mm_page_free_batched \
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-a --repeat 10 \
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sleep 1
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Performance counter stats for 'sleep 1' (10 runs):
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1066 kmem:mm_page_alloc ( +- 26.148% )
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182 kmem:mm_page_free_direct ( +- 5.464% )
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890 kmem:mm_pagevec_free ( +- 30.079% )
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182 kmem:mm_page_free ( +- 5.464% )
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890 kmem:mm_page_free_batched ( +- 30.079% )
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1.002251757 seconds time elapsed ( +- 0.005% )
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@ -220,8 +220,8 @@ were generating events within the kernel. To begin this sort of analysis, the
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data must be recorded. At the time of writing, this required root:
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$ perf record -c 1 \
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-e kmem:mm_page_alloc -e kmem:mm_page_free_direct \
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-e kmem:mm_pagevec_free \
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-e kmem:mm_page_alloc -e kmem:mm_page_free \
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-e kmem:mm_page_free_batched \
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./hackbench 10
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Time: 0.894
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[ perf record: Captured and wrote 0.733 MB perf.data (~32010 samples) ]
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@ -260,8 +260,8 @@ noticed that X was generating an insane amount of page allocations so let's look
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at it:
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$ perf record -c 1 -f \
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-e kmem:mm_page_alloc -e kmem:mm_page_free_direct \
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-e kmem:mm_pagevec_free \
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-e kmem:mm_page_alloc -e kmem:mm_page_free \
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-e kmem:mm_page_free_batched \
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-p `pidof X`
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This was interrupted after a few seconds and
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@ -17,8 +17,8 @@ titan:~> perf list
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kmem:kmem_cache_alloc_node [Tracepoint event]
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kmem:kfree [Tracepoint event]
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kmem:kmem_cache_free [Tracepoint event]
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kmem:mm_page_free_direct [Tracepoint event]
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kmem:mm_pagevec_free [Tracepoint event]
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kmem:mm_page_free [Tracepoint event]
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kmem:mm_page_free_batched [Tracepoint event]
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kmem:mm_page_alloc [Tracepoint event]
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kmem:mm_page_alloc_zone_locked [Tracepoint event]
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kmem:mm_page_pcpu_drain [Tracepoint event]
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@ -29,15 +29,15 @@ measured. For example the page alloc/free properties of a 'hackbench
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run' are:
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titan:~> perf stat -e kmem:mm_page_pcpu_drain -e kmem:mm_page_alloc
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-e kmem:mm_pagevec_free -e kmem:mm_page_free_direct ./hackbench 10
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-e kmem:mm_page_free_batched -e kmem:mm_page_free ./hackbench 10
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Time: 0.575
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Performance counter stats for './hackbench 10':
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13857 kmem:mm_page_pcpu_drain
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27576 kmem:mm_page_alloc
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6025 kmem:mm_pagevec_free
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20934 kmem:mm_page_free_direct
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6025 kmem:mm_page_free_batched
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20934 kmem:mm_page_free
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0.613972165 seconds time elapsed
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@ -45,8 +45,8 @@ You can observe the statistical properties as well, by using the
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'repeat the workload N times' feature of perf stat:
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titan:~> perf stat --repeat 5 -e kmem:mm_page_pcpu_drain -e
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kmem:mm_page_alloc -e kmem:mm_pagevec_free -e
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kmem:mm_page_free_direct ./hackbench 10
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kmem:mm_page_alloc -e kmem:mm_page_free_batched -e
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kmem:mm_page_free ./hackbench 10
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Time: 0.627
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Time: 0.644
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Time: 0.564
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@ -57,8 +57,8 @@ You can observe the statistical properties as well, by using the
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12920 kmem:mm_page_pcpu_drain ( +- 3.359% )
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25035 kmem:mm_page_alloc ( +- 3.783% )
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6104 kmem:mm_pagevec_free ( +- 0.934% )
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18376 kmem:mm_page_free_direct ( +- 4.941% )
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6104 kmem:mm_page_free_batched ( +- 0.934% )
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18376 kmem:mm_page_free ( +- 4.941% )
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0.643954516 seconds time elapsed ( +- 2.363% )
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@ -158,15 +158,15 @@ Or you can observe the whole system's page allocations for 10
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seconds:
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titan:~/git> perf stat -a -e kmem:mm_page_pcpu_drain -e
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kmem:mm_page_alloc -e kmem:mm_pagevec_free -e
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kmem:mm_page_free_direct sleep 10
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kmem:mm_page_alloc -e kmem:mm_page_free_batched -e
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kmem:mm_page_free sleep 10
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Performance counter stats for 'sleep 10':
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171585 kmem:mm_page_pcpu_drain
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322114 kmem:mm_page_alloc
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73623 kmem:mm_pagevec_free
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254115 kmem:mm_page_free_direct
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73623 kmem:mm_page_free_batched
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254115 kmem:mm_page_free
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10.000591410 seconds time elapsed
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@ -174,15 +174,15 @@ Or observe how fluctuating the page allocations are, via statistical
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analysis done over ten 1-second intervals:
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titan:~/git> perf stat --repeat 10 -a -e kmem:mm_page_pcpu_drain -e
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kmem:mm_page_alloc -e kmem:mm_pagevec_free -e
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kmem:mm_page_free_direct sleep 1
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kmem:mm_page_alloc -e kmem:mm_page_free_batched -e
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kmem:mm_page_free sleep 1
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Performance counter stats for 'sleep 1' (10 runs):
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17254 kmem:mm_page_pcpu_drain ( +- 3.709% )
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34394 kmem:mm_page_alloc ( +- 4.617% )
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7509 kmem:mm_pagevec_free ( +- 4.820% )
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25653 kmem:mm_page_free_direct ( +- 3.672% )
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7509 kmem:mm_page_free_batched ( +- 4.820% )
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25653 kmem:mm_page_free ( +- 3.672% )
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1.058135029 seconds time elapsed ( +- 3.089% )
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