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mm: cma: add functions to get region pages counters

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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.

[[email protected]: move debug code from cma.c into cma_debug.c]
[[email protected]: move code from cma_get_used() and cma_get_maxchunk() to cma_used_get() and cma_maxchunk_get()]
Signed-off-by: Dmitry Safonov <[email protected]>
Signed-off-by: Stefan Strogin <[email protected]>
Acked-by: Michal Nazarewicz <[email protected]>
Cc: Marek Szyprowski <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Cc: Pintu Kumar <[email protected]>
Cc: Weijie Yang <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: Vyacheslav Tyrtov <[email protected]>
Cc: Aleksei Mateosian <[email protected]>
Signed-off-by: Stefan Strogin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Dmitry Safonov 2015-04-15 16:14:59 -07:00 • committed by Linus Torvalds
commit 2e32b94760
1 changed files with 40 additions and 0 deletions
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40
mm/cma_debug.c
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@ -33,6 +33,44 @@ static int cma_debugfs_get(void *data, u64 *val)
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;
unsigned long used;
mutex_lock(&cma->lock);
/* pages counter is smaller than sizeof(int) */
used = bitmap_weight(cma->bitmap, (int)cma->count);
mutex_unlock(&cma->lock);
*val = (u64)used << cma->order_per_bit;
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;
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);
*val = (u64)maxchunk << cma->order_per_bit;
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 +187,8 @@ static void cma_debugfs_add_one(struct cma *cma, int idx)
&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);