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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 /mm/cma_sysfs.c | |
| parent | 501e3dc505f7c8ce8da0532db81e99fae6688074 (diff) | |
| download | linux-b9ad003af13a1fe34319da6c2082038bce833831.tar.gz linux-b9ad003af13a1fe34319da6c2082038bce833831.tar.bz2 linux-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 'mm/cma_sysfs.c')
| -rw-r--r-- | mm/cma_sysfs.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/mm/cma_sysfs.c b/mm/cma_sysfs.c index 56347d15b7e8..f50db3973171 100644 --- a/mm/cma_sysfs.c +++ b/mm/cma_sysfs.c @@ -24,6 +24,11 @@ void cma_sysfs_account_fail_pages(struct cma *cma, unsigned long nr_pages) atomic64_add(nr_pages, &cma->nr_pages_failed); } +void cma_sysfs_account_release_pages(struct cma *cma, unsigned long nr_pages) +{ + atomic64_add(nr_pages, &cma->nr_pages_released); +} + static inline struct cma *cma_from_kobj(struct kobject *kobj) { return container_of(kobj, struct cma_kobject, kobj)->cma; @@ -48,6 +53,15 @@ static ssize_t alloc_pages_fail_show(struct kobject *kobj, } CMA_ATTR_RO(alloc_pages_fail); +static ssize_t release_pages_success_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct cma *cma = cma_from_kobj(kobj); + + return sysfs_emit(buf, "%llu\n", atomic64_read(&cma->nr_pages_released)); +} +CMA_ATTR_RO(release_pages_success); + static void cma_kobj_release(struct kobject *kobj) { struct cma *cma = cma_from_kobj(kobj); @@ -60,6 +74,7 @@ static void cma_kobj_release(struct kobject *kobj) static struct attribute *cma_attrs[] = { &alloc_pages_success_attr.attr, &alloc_pages_fail_attr.attr, + &release_pages_success_attr.attr, NULL, }; ATTRIBUTE_GROUPS(cma); |