The patch titled Subject: mm: cma: add functions to get region pages counters has been added to the -mm tree. Its filename is mm-cma-add-functions-to-get-region-pages-counters.patch This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/mm-cma-add-functions-to-get-region-pages-counters.patch and later at http://ozlabs.org/~akpm/mmotm/broken-out/mm-cma-add-functions-to-get-region-pages-counters.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Dmitry Safonov <d.safonov@xxxxxxxxxxxxxxxxxxx> Subject: mm: cma: add functions to get region pages counters Here are two functions that provide interface to compute/get used size and size of biggest free chunk in cma region. Add that information to debugfs. Signed-off-by: Dmitry Safonov <d.safonov@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Stefan Strogin <stefan.strogin@xxxxxxxxx> Acked-by: Michal Nazarewicz <mina86@xxxxxxxxxx> Cc: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> Cc: Pintu Kumar <pintu.k@xxxxxxxxxxx> Cc: Weijie Yang <weijie.yang@xxxxxxxxxxx> Cc: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx> Cc: Vyacheslav Tyrtov <v.tyrtov@xxxxxxxxxxx> Cc: Aleksei Mateosian <a.mateosian@xxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- include/linux/cma.h | 2 ++ mm/cma.c | 30 ++++++++++++++++++++++++++++++ mm/cma_debug.c | 24 ++++++++++++++++++++++++ 3 files changed, 56 insertions(+) diff -puN include/linux/cma.h~mm-cma-add-functions-to-get-region-pages-counters include/linux/cma.h --- a/include/linux/cma.h~mm-cma-add-functions-to-get-region-pages-counters +++ a/include/linux/cma.h @@ -18,6 +18,8 @@ struct cma; extern unsigned long totalcma_pages; extern phys_addr_t cma_get_base(const struct cma *cma); extern unsigned long cma_get_size(const struct cma *cma); +extern unsigned long cma_get_used(struct cma *cma); +extern unsigned long cma_get_maxchunk(struct cma *cma); extern int __init cma_declare_contiguous(phys_addr_t base, phys_addr_t size, phys_addr_t limit, diff -puN mm/cma.c~mm-cma-add-functions-to-get-region-pages-counters mm/cma.c --- a/mm/cma.c~mm-cma-add-functions-to-get-region-pages-counters +++ a/mm/cma.c @@ -53,6 +53,36 @@ unsigned long cma_get_size(const struct return cma->count << PAGE_SHIFT; } +unsigned long cma_get_used(struct cma *cma) +{ + unsigned long ret = 0; + + mutex_lock(&cma->lock); + /* pages counter is smaller than sizeof(int) */ + ret = bitmap_weight(cma->bitmap, (int)cma->count); + mutex_unlock(&cma->lock); + + return ret << cma->order_per_bit; +} + +unsigned long cma_get_maxchunk(struct cma *cma) +{ + unsigned long maxchunk = 0; + unsigned long start, end = 0; + + mutex_lock(&cma->lock); + for (;;) { + start = find_next_zero_bit(cma->bitmap, cma->count, end); + if (start >= cma->count) + break; + end = find_next_bit(cma->bitmap, cma->count, start); + maxchunk = max(end - start, maxchunk); + } + mutex_unlock(&cma->lock); + + return maxchunk << cma->order_per_bit; +} + static unsigned long cma_bitmap_aligned_mask(const struct cma *cma, int align_order) { diff -puN mm/cma_debug.c~mm-cma-add-functions-to-get-region-pages-counters mm/cma_debug.c --- a/mm/cma_debug.c~mm-cma-add-functions-to-get-region-pages-counters +++ a/mm/cma_debug.c @@ -33,6 +33,28 @@ static int cma_debugfs_get(void *data, u DEFINE_SIMPLE_ATTRIBUTE(cma_debugfs_fops, cma_debugfs_get, NULL, "%llu\n"); +static int cma_used_get(void *data, u64 *val) +{ + struct cma *cma = data; + + *val = cma_get_used(cma); + + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(cma_used_fops, cma_used_get, NULL, "%llu\n"); + +static int cma_maxchunk_get(void *data, u64 *val) +{ + struct cma *cma = data; + + *val = cma_get_maxchunk(cma); + + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(cma_maxchunk_fops, cma_maxchunk_get, NULL, "%llu\n"); + static void cma_add_to_cma_mem_list(struct cma *cma, struct cma_mem *mem) { spin_lock(&cma->mem_head_lock); @@ -149,6 +171,8 @@ static void cma_debugfs_add_one(struct c &cma->count, &cma_debugfs_fops); debugfs_create_file("order_per_bit", S_IRUGO, tmp, &cma->order_per_bit, &cma_debugfs_fops); + debugfs_create_file("used", S_IRUGO, tmp, cma, &cma_used_fops); + debugfs_create_file("maxchunk", S_IRUGO, tmp, cma, &cma_maxchunk_fops); u32s = DIV_ROUND_UP(cma_bitmap_maxno(cma), BITS_PER_BYTE * sizeof(u32)); debugfs_create_u32_array("bitmap", S_IRUGO, tmp, (u32*)cma->bitmap, u32s); _ Patches currently in -mm which might be from d.safonov@xxxxxxxxxxxxxxxxxxx are mm-cma-add-functions-to-get-region-pages-counters.patch mm-cma-add-functions-to-get-region-pages-counters-fix.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html