Messages in this thread | ![/](/images/icornerl.gif) | | Date | Tue, 31 Jan 2023 10:10:40 -0800 | From | Roman Gushchin <> | Subject | Re: [PATCH] mm,page_alloc,cma: configurable CMA utilization |
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On Mon, Jan 30, 2023 at 11:10:52PM -0800, Sukadev Bhattiprolu wrote: > > Commit 16867664936e ("mm,page_alloc,cma: conditionally prefer cma pageblocks for movable allocations") > added support to use CMA pages when more than 50% of total free pages in > the zone are free CMA pages. > > However, with multiplatform kernels a single binary is used across different > targets of varying memory sizes. A low memory target using one such kernel > would incur allocation failures even when sufficient memory is available in > the CMA region. On these targets we would want to utilize a higher percentage > of the CMA region and reduce the allocation failures, even if it means that a > subsequent cma_alloc() would take longer. > > Make the percentage of CMA utilization a configurable parameter to allow > for such usecases. > > Signed-off-by: Sukadev Bhattiprolu <quic_sukadev@quicinc.com> > --- > Note: There was a mention about it being the last resort to making this > percentage configurable (https://lkml.org/lkml/2020/3/12/751). But > as explained above, multi-platform kernels for varying memory size > targets would need this to be configurable.
Hi Sukadev!
Can you, please, share a bit more details about your setup? E.g. what is the zone size, the cma area size and the value you want to set your sysctl to?
Roman
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