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Merge "mm: cma: Increase retries if less blocks available"

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qctecmdr 2019-10-24 23:39:34 -07:00 • committed by Gerrit - the friendly Code Review server
commit b95c1d307e
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;
@ -480,8 +482,15 @@ 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.
@ -499,6 +508,8 @@ 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