f60c5572d2
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/ Change-Id: Iad46f0405b416e29ae788f82b79c9953513a9c9d 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> [isaacm@codeaurora.org: Resolve merge conflicts to account for new mm features] Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org> [quic_sukadev@quicinc.com: dropped unused gfp_flags parameter to __rmqueue_pcplist(), resolved some conflicts] Signed-off-by: Sukadev Bhattiprolu <quic_sukadev@quicinc.com> |
||
|---|---|---|
| .. | ||
| asm | ||
| uapi/asm | ||