diff options
| author | Anshuman Khandual <anshuman.khandual@arm.com> | 2024-02-06 07:57:31 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-02-22 21:24:57 +0300 |
| commit | b9ad003af13a1fe34319da6c2082038bce833831 (patch) | |
| tree | 7adb6a1e9eb762f06869eb88a9c9676726d21b6b /mm/cma.h | |
| parent | 501e3dc505f7c8ce8da0532db81e99fae6688074 (diff) | |
| download | linux-b9ad003af13a1fe34319da6c2082038bce833831.tar.xz | |
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 'mm/cma.h')
| -rw-r--r-- | mm/cma.h | 5 |
1 files changed, 5 insertions, 0 deletions
@@ -27,6 +27,8 @@ struct cma { atomic64_t nr_pages_succeeded; /* the number of CMA page allocation failures */ atomic64_t nr_pages_failed; + /* the number of CMA page released */ + atomic64_t nr_pages_released; /* kobject requires dynamic object */ struct cma_kobject *cma_kobj; #endif @@ -44,10 +46,13 @@ static inline unsigned long cma_bitmap_maxno(struct cma *cma) #ifdef CONFIG_CMA_SYSFS void cma_sysfs_account_success_pages(struct cma *cma, unsigned long nr_pages); void cma_sysfs_account_fail_pages(struct cma *cma, unsigned long nr_pages); +void cma_sysfs_account_release_pages(struct cma *cma, unsigned long nr_pages); #else static inline void cma_sysfs_account_success_pages(struct cma *cma, unsigned long nr_pages) {}; static inline void cma_sysfs_account_fail_pages(struct cma *cma, unsigned long nr_pages) {}; +static inline void cma_sysfs_account_release_pages(struct cma *cma, + unsigned long nr_pages) {}; #endif #endif |