Messages in this thread | | | Subject | Re: [PATCH v2 2/2] mm/pageblock: remove false sharing in pageblock_flags | From | Anshuman Khandual <> | Date | Wed, 19 Aug 2020 13:27:04 +0530 |
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On 08/19/2020 11:17 AM, Alex Shi wrote: > Current pageblock_flags is only 4 bits, so it has to share a char size > in cmpxchg when get set, the false sharing cause perf drop. > > If we incrase the bits up to 8, false sharing would gone in cmpxchg. and > the only cost is half char per pageblock, which is half char per 128MB > on x86, 4 chars in 1 GB.
Agreed that increase in memory utilization is negligible here but does this really improve performance ?
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