xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ANDROID: cma: redirect page allocation to CMA

Browse Source 
CMA pages are designed to be used as fallback for movable allocations
and cannot be used for non-movable allocations. If CMA pages are
utilized poorly, non-movable allocations may end up getting starved if
all regular movable pages are allocated and the only pages left are
CMA. Always using CMA pages first creates unacceptable performance
problems. As a midway alternative, use CMA pages for certain
userspace allocations. The userspace pages can be migrated or dropped
quickly which giving decent utilization.

Additionally, add a fall-backs for failed CMA allocations in rmqueue()
and __rmqueue_pcplist() (the latter addition being driven by a report
by the kernel test robot); these fallbacks were dealt with differently
in the original version of the patch as the rmqueue() call chain has
changed).

Bug: 158645321
Link: https://lore.kernel.org/lkml/cover.1604282969.git.cgoldswo@codeaurora.org/
Reported-by: kernel test robot <rong.a.chen@intel.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Heesub Shin <heesub.shin@samsung.com>
Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org>
[cgoldswo@codeaurora.org: Place in bugfixes; remove cma_alloc zone flag]
Signed-off-by: Chris Goldsworthy <cgoldswo@codeaurora.org>
Change-Id: Ibca5eedfc5eacd44542ad483851d741166715f84
This commit is contained in:
Heesub Shin
2013-01-06 18:10:00 -08:00
committed by Chris Goldsworthy
parent f93a33edc8
commit 7ff00a49a2
4 changed files with 73 additions and 31 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
include/linux/highmem.h
View File

@@ -274,7 +274,9 @@ static inline struct page *
alloc_zeroed_user_highpage_movable(struct vm_area_struct *vma,
unsigned long vaddr)
{
return __alloc_zeroed_user_highpage(__GFP_MOVABLE, vma, vaddr);
return __alloc_zeroed_user_highpage(
__GFP_MOVABLE|__GFP_CMA, vma,
vaddr);
}
static inline void clear_highpage(struct page *page)