https://github.com/torvalds/linux
Revision 57f29762cdd4687a02f245d1b1e78de046388eac authored by Johannes Weiner on 20 August 2021, 02:04:27 UTC, committed by Linus Torvalds on 20 August 2021, 18:31:42 UTC
In a debugging session the other day, Rik noticed that node_reclaim() was missing memstall annotations. This means we'll miss pressure and lost productivity resulting from reclaim on an overloaded local NUMA node when vm.zone_reclaim_mode is enabled. There haven't been any reports, but that's likely because vm.zone_reclaim_mode hasn't been a commonly used feature recently, and the intersection between such setups and psi users is probably nil. But secondary memory such as CXL-connected DIMMS, persistent memory etc, and the page demotion patches that handle them (https://lore.kernel.org/lkml/20210401183216.443C4443@viggo.jf.intel.com/) could soon make this a more common codepath again. Link: https://lkml.kernel.org/r/20210818152457.35846-1-hannes@cmpxchg.org Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Reported-by: Rik van Riel <riel@surriel.com> Reviewed-by: Shakeel Butt <shakeelb@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent fcc0062
Tip revision: 57f29762cdd4687a02f245d1b1e78de046388eac authored by Johannes Weiner on 20 August 2021, 02:04:27 UTC
mm: vmscan: fix missing psi annotation for node_reclaim()
mm: vmscan: fix missing psi annotation for node_reclaim()
Tip revision: 57f2976
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