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Docs/admin-guide/mm/damon/usage: update for changed initail_regions file input
A previous commit made init_regions debugfs file to use target index instead of target id for specifying the target of the init regions. This commit updates the usage document to reflect the change. Link: https://lkml.kernel.org/r/20211230100723.2238-3-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -108,19 +108,23 @@ In such cases, users can explicitly set the initial monitoring target regions
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as they want, by writing proper values to the ``init_regions`` file. Each line
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of the input should represent one region in below form.::
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<target id> <start address> <end address>
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<target idx> <start address> <end address>
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The ``target id`` should already in ``target_ids`` file, and the regions should
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be passed in address order. For example, below commands will set a couple of
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address ranges, ``1-100`` and ``100-200`` as the initial monitoring target
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region of process 42, and another couple of address ranges, ``20-40`` and
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``50-100`` as that of process 4242.::
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The ``target idx`` should be the index of the target in ``target_ids`` file,
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starting from ``0``, and the regions should be passed in address order. For
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example, below commands will set a couple of address ranges, ``1-100`` and
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``100-200`` as the initial monitoring target region of pid 42, which is the
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first one (index ``0``) in ``target_ids``, and another couple of address
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ranges, ``20-40`` and ``50-100`` as that of pid 4242, which is the second one
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(index ``1``) in ``target_ids``.::
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# cd <debugfs>/damon
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# echo "42 1 100
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42 100 200
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4242 20 40
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4242 50 100" > init_regions
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# cat target_ids
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42 4242
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# echo "0 1 100
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0 100 200
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1 20 40
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1 50 100" > init_regions
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Note that this sets the initial monitoring target regions only. In case of
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virtual memory monitoring, DAMON will automatically updates the boundary of the
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