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Commit b35a5584 authored by Shiraz Hashim's avatar Shiraz Hashim Committed by Gerrit - the friendly Code Review server
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mm: cma: Increase retries if less blocks available 



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: default avatarShiraz Hashim <shashim@codeaurora.org>
parent 202aa1fb

mm/cma.c

+12 −1
Original line number Diff line number Diff line
@@ -438,6 +438,8 @@ struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align) 
	struct page *page = NULL;

	int retry_after_sleep = 0;

	int ret = -ENOMEM;

	int max_retries = 2;

	int available_regions = 0;



	if (!cma || !cma->count)

		return NULL;
@@ -464,8 +466,15 @@ 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.
@@ -483,6 +492,8 @@ 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