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: Shiraz Hashim <shashim@codeaurora.org>
diff --git a/mm/cma.c b/mm/cma.c
index 5fc1809..e97ad01 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -438,6 +438,8 @@
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;
@@ -464,9 +466,16 @@
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.
* in exit path, during unmap call, or process
@@ -483,6 +492,8 @@
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