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mm: vmstat: add cma statistics

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Since CMA is used more widely, it's worth to have CMA allocation
statistics into vmstat.  With it, we could know how agressively system
uses cma allocation and how often it fails.

Link: https://lkml.kernel.org/r/20210302183346.3707237-1-minchan@kernel.org
Signed-off-by: Minchan Kim <minchan@kernel.org>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Cc: John Dias <joaodias@google.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Minchan Kim 2021-05-04 18:37:19 -07:00 committed by Linus Torvalds
parent 7ee820ee72
commit bbb269206f
3 changed files with 17 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
include/linux/vm_event_item.h
View file

@ -70,6 +70,10 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
#endif
#ifdef CONFIG_HUGETLB_PAGE
HTLB_BUDDY_PGALLOC, HTLB_BUDDY_PGALLOC_FAIL,
#endif
#ifdef CONFIG_CMA
CMA_ALLOC_SUCCESS,
CMA_ALLOC_FAIL,
#endif
UNEVICTABLE_PGCULLED, /* culled to noreclaim list */
UNEVICTABLE_PGSCANNED, /* scanned for reclaimability */

12
mm/cma.c
View file

@ -435,13 +435,13 @@ struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
int ret = -ENOMEM;
if (!cma || !cma->count || !cma->bitmap)
return NULL;
goto out;
pr_debug("%s(cma %p, count %zu, align %d)\n", __func__, (void *)cma,
count, align);
if (!count)
return NULL;
goto out;
mask = cma_bitmap_aligned_mask(cma, align);
offset = cma_bitmap_aligned_offset(cma, align);
@ -449,7 +449,7 @@ struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
bitmap_count = cma_bitmap_pages_to_bits(cma, count);
if (bitmap_count > bitmap_maxno)
return NULL;
goto out;
for (;;) {
spin_lock_irq(&cma->lock);
@ -506,6 +506,12 @@ struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
}
pr_debug("%s(): returned %p\n", __func__, page);
out:
if (page)
count_vm_event(CMA_ALLOC_SUCCESS);
else
count_vm_event(CMA_ALLOC_FAIL);
return page;
}

4
mm/vmstat.c
View file

@ -1312,6 +1312,10 @@ const char * const vmstat_text[] = {
#ifdef CONFIG_HUGETLB_PAGE
"htlb_buddy_alloc_success",
"htlb_buddy_alloc_fail",
#endif
#ifdef CONFIG_CMA
"cma_alloc_success",
"cma_alloc_fail",
#endif
"unevictable_pgs_culled",
"unevictable_pgs_scanned",