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Since CMA is getting used more widely, it's more important to keep monitoring CMA statistics for system health since it's directly related to user experience. This patch introduces sysfs statistics for CMA, in order to provide some basic monitoring of the CMA allocator. * the number of CMA page successful allocations * the number of CMA page allocation failures These two values allow the user to calcuate the allocation failure rate for each CMA area. e.g.) /sys/kernel/mm/cma/WIFI/alloc_pages_[success|fail] /sys/kernel/mm/cma/SENSOR/alloc_pages_[success|fail] /sys/kernel/mm/cma/BLUETOOTH/alloc_pages_[success|fail] The cma_stat was intentionally allocated by dynamic allocation to harmonize with kobject lifetime management. https://lore.kernel.org/linux-mm/YCOAmXqt6dZkCQYs@kroah.com/ Link: https://lkml.kernel.org/r/20210324230759.2213957-1-minchan@kernel.org Link: https://lore.kernel.org/linux-mm/20210316100433.17665-1-colin.king@canonical.com/ Signed-off-by: Minchan Kim <minchan@kernel.org> Signed-off-by: Colin Ian King <colin.king@canonical.com> Tested-by: Dmitry Osipenko <digetx@gmail.com> Reviewed-by: Dmitry Osipenko <digetx@gmail.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: John Hubbard <jhubbard@nvidia.com> Tested-by: Anders Roxell <anders.roxell@linaro.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: John Dias <joaodias@google.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Colin Ian King <colin.king@canonical.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
25 lines
739 B
Text
25 lines
739 B
Text
What: /sys/kernel/mm/cma/
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Date: Feb 2021
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Contact: Minchan Kim <minchan@kernel.org>
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Description:
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/sys/kernel/mm/cma/ contains a subdirectory for each CMA
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heap name (also sometimes called CMA areas).
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Each CMA heap subdirectory (that is, each
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/sys/kernel/mm/cma/<cma-heap-name> directory) contains the
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following items:
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alloc_pages_success
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alloc_pages_fail
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What: /sys/kernel/mm/cma/<cma-heap-name>/alloc_pages_success
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Date: Feb 2021
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Contact: Minchan Kim <minchan@kernel.org>
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Description:
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the number of pages CMA API succeeded to allocate
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What: /sys/kernel/mm/cma/<cma-heap-name>/alloc_pages_fail
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Date: Feb 2021
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Contact: Minchan Kim <minchan@kernel.org>
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Description:
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the number of pages CMA API failed to allocate
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