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Docs/admin-guide/mm/damon/start: simplify the content
Information in 'TL; DR' section of 'Getting Started' is duplicated in other parts of the doc. It is also asking readers to visit the access pattern visualizations gallery web site to show the results of example visualization commands, while the users of the commands can use terminal output. To make the doc simple, this removes the duplicated 'TL; DR' section and replaces the visualization example commands with versions using terminal outputs. Link: https://lkml.kernel.org/r/20211022090311.3856-4-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Peter Xu <peterx@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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SeongJae Park
Linus Torvalds
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@ -11,38 +11,6 @@ of its features for brevity. Please refer to the usage `doc
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details.
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TL; DR
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======
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Follow the commands below to monitor and visualize the memory access pattern of
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your workload. ::
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# # build the kernel with CONFIG_DAMON_*=y, install it, and reboot
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# mount -t debugfs none /sys/kernel/debug/
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# git clone https://github.com/awslabs/damo
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# ./damo/damo record $(pidof <your workload>)
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# ./damo/damo report heats --heatmap stdout
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The final command draws the access heatmap of ``<your workload>``. The heatmap
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shows which memory region (x-axis) is accessed when (y-axis) and how frequently
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(number; the higher the more accesses have been observed). ::
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111111111111111111111111111111111111111111111111111111110000
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111121111111111111111111111111211111111111111111111111110000
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000000000000000000000000000000000000000000000000001555552000
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000000000000000000000000000000000000000000000222223555552000
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000000000000000000000000000000000000000011111677775000000000
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000000000000000000000000000000000000000488888000000000000000
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000000000000000000000000000000000177888400000000000000000000
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000000000000000000000000000046666522222100000000000000000000
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000000000000000000000014444344444300000000000000000000000000
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000000000000000002222245555510000000000000000000000000000000
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# access_frequency: 0 1 2 3 4 5 6 7 8 9
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# x-axis: space (140286319947776-140286426374096: 101.496 MiB)
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# y-axis: time (605442256436361-605479951866441: 37.695430s)
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# resolution: 60x10 (1.692 MiB and 3.770s for each character)
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Prerequisites
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=============
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@ -93,22 +61,66 @@ pattern in the ``damon.data`` file.
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Visualizing Recorded Patterns
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=============================
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The following three commands visualize the recorded access patterns and save
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the results as separate image files. ::
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You can visualize the pattern in a heatmap, showing which memory region
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(x-axis) got accessed when (y-axis) and how frequently (number).::
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$ sudo damo report heats --heatmap access_pattern_heatmap.png
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$ sudo damo report wss --range 0 101 1 --plot wss_dist.png
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$ sudo damo report wss --range 0 101 1 --sortby time --plot wss_chron_change.png
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$ sudo damo report heats --heatmap stdout
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22222222222222222222222222222222222222211111111111111111111111111111111111111100
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44444444444444444444444444444444444444434444444444444444444444444444444444443200
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44444444444444444444444444444444444444433444444444444444444444444444444444444200
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33333333333333333333333333333333333333344555555555555555555555555555555555555200
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33333333333333333333333333333333333344444444444444444444444444444444444444444200
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22222222222222222222222222222222222223355555555555555555555555555555555555555200
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00000000000000000000000000000000000000288888888888888888888888888888888888888400
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00000000000000000000000000000000000000288888888888888888888888888888888888888400
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33333333333333333333333333333333333333355555555555555555555555555555555555555200
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88888888888888888888888888888888888888600000000000000000000000000000000000000000
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88888888888888888888888888888888888888600000000000000000000000000000000000000000
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33333333333333333333333333333333333333444444444444444444444444444444444444443200
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00000000000000000000000000000000000000288888888888888888888888888888888888888400
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[...]
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# access_frequency: 0 1 2 3 4 5 6 7 8 9
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# x-axis: space (139728247021568-139728453431248: 196.848 MiB)
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# y-axis: time (15256597248362-15326899978162: 1 m 10.303 s)
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# resolution: 80x40 (2.461 MiB and 1.758 s for each character)
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- ``access_pattern_heatmap.png`` will visualize the data access pattern in a
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heatmap, showing which memory region (y-axis) got accessed when (x-axis)
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and how frequently (color).
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- ``wss_dist.png`` will show the distribution of the working set size.
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- ``wss_chron_change.png`` will show how the working set size has
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chronologically changed.
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You can also visualize the distribution of the working set size, sorted by the
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size.::
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You can view the visualizations of this example workload at [1]_.
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Visualizations of other realistic workloads are available at [2]_ [3]_ [4]_.
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$ sudo damo report wss --range 0 101 10
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# <percentile> <wss>
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# target_id 18446632103789443072
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# avr: 107.708 MiB
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0 0 B | |
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10 95.328 MiB |**************************** |
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20 95.332 MiB |**************************** |
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30 95.340 MiB |**************************** |
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40 95.387 MiB |**************************** |
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50 95.387 MiB |**************************** |
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60 95.398 MiB |**************************** |
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70 95.398 MiB |**************************** |
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80 95.504 MiB |**************************** |
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90 190.703 MiB |********************************************************* |
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100 196.875 MiB |***********************************************************|
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Using ``--sortby`` option with the above command, you can show how the working
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set size has chronologically changed.::
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$ sudo damo report wss --range 0 101 10 --sortby time
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# <percentile> <wss>
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# target_id 18446632103789443072
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# avr: 107.708 MiB
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0 3.051 MiB | |
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10 190.703 MiB |***********************************************************|
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20 95.336 MiB |***************************** |
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30 95.328 MiB |***************************** |
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40 95.387 MiB |***************************** |
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50 95.332 MiB |***************************** |
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60 95.320 MiB |***************************** |
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70 95.398 MiB |***************************** |
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80 95.398 MiB |***************************** |
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90 95.340 MiB |***************************** |
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100 95.398 MiB |***************************** |
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Data Access Pattern Aware Memory Management
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@ -120,8 +132,3 @@ accessed for >=60 seconds in your workload to be swapped out. ::
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$ echo "#min-size max-size min-acc max-acc min-age max-age action" > test_scheme
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$ echo "4K max 0 0 60s max pageout" >> test_scheme
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$ damo schemes -c test_scheme <pid of your workload>
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.. [1] https://damonitor.github.io/doc/html/v17/admin-guide/mm/damon/start.html#visualizing-recorded-patterns
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.. [2] https://damonitor.github.io/test/result/visual/latest/rec.heatmap.1.png.html
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.. [3] https://damonitor.github.io/test/result/visual/latest/rec.wss_sz.png.html
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.. [4] https://damonitor.github.io/test/result/visual/latest/rec.wss_time.png.html
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