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| author | Anshuman Khandual <anshuman.khandual@arm.com> | 2024-02-06 10:27:31 +0530 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-02-22 10:24:57 -0800 |
| commit | b9ad003af13a1fe34319da6c2082038bce833831 (patch) | |
| tree | 7adb6a1e9eb762f06869eb88a9c9676726d21b6b /Documentation/ABI | |
| parent | 501e3dc505f7c8ce8da0532db81e99fae6688074 (diff) | |
| download | linux-stable-b9ad003af13a1fe34319da6c2082038bce833831.tar.gz linux-stable-b9ad003af13a1fe34319da6c2082038bce833831.tar.bz2 linux-stable-b9ad003af13a1fe34319da6c2082038bce833831.zip | |
mm/cma: add sysfs file 'release_pages_success'
This adds the following new sysfs file tracking the number of successfully
released pages from a given CMA heap area. This file will be available
via CONFIG_CMA_SYSFS and help in determining active CMA pages available on
the CMA heap area. This adds a new 'nr_pages_released' (CONFIG_CMA_SYSFS)
into 'struct cma' which gets updated during cma_release().
/sys/kernel/mm/cma/<cma-heap-area>/release_pages_success
After this change, an user will be able to find active CMA pages available
in a given CMA heap area via the following method.
Active pages = alloc_pages_success - release_pages_success
That's valuable information for both software designers, and system admins
as it allows them to tune the number of CMA pages available in the system.
This increases user visibility for allocated CMA area and its
utilization.
Link: https://lkml.kernel.org/r/20240206045731.472759-1-anshuman.khandual@arm.com
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'Documentation/ABI')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-kernel-mm-cma | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-kernel-mm-cma b/Documentation/ABI/testing/sysfs-kernel-mm-cma index 02b2bb60c296..dfd755201142 100644 --- a/Documentation/ABI/testing/sysfs-kernel-mm-cma +++ b/Documentation/ABI/testing/sysfs-kernel-mm-cma @@ -23,3 +23,9 @@ Date: Feb 2021 Contact: Minchan Kim <minchan@kernel.org> Description: the number of pages CMA API failed to allocate + +What: /sys/kernel/mm/cma/<cma-heap-name>/release_pages_success +Date: Feb 2024 +Contact: Anshuman Khandual <anshuman.khandual@arm.com> +Description: + the number of pages CMA API succeeded to release |