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mm: cma: Increase retries if less blocks available

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If a particular cma region has lesser free blocks then
increase retries to avoid allocation failure due to page
being temporarily busy.

Change-Id: I92021fd75315b266a978f7a5b0235344c800cba2
Signed-off-by: Shiraz Hashim <shashim@codeaurora.org>
Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org>
This commit is contained in:
Shiraz Hashim 2018-05-01 17:58:51 +05:30 • committed by Gerrit - the friendly Code Review server
commit 5a883fb75e
1 changed files with 12 additions and 1 deletions
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13
mm/cma.c
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@ -454,6 +454,8 @@ struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
struct page *page = NULL;
int ret = -ENOMEM;
int retry_after_sleep = 0;
int max_retries = 2;
int available_regions = 0;
if (!cma || !cma->count)
return NULL;
@ -478,8 +480,15 @@ struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
bitmap_maxno, start, bitmap_count, mask,
offset);
if (bitmap_no >= bitmap_maxno) {
if (retry_after_sleep < 2) {
if (retry_after_sleep < max_retries) {
start = 0;
/*
* update max retries if available free regions
* are less.
*/
if (available_regions < 3)
max_retries = 5;
available_regions = 0;
/*
* Page may be momentarily pinned by some other
* process which has been scheduled out, eg.
@ -497,6 +506,8 @@ struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
break;
}
}
available_regions++;
bitmap_set(cma->bitmap, bitmap_no, bitmap_count);
/*
* It's safe to drop the lock here. We've marked this region for