powerpc: Chunk calls to flush_dcache_range in arch_*_memory

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When presented with large amounts of memory being hotplugged
(in my test case, ~890GB), the call to flush_dcache_range takes
a while (~50 seconds), triggering RCU stalls.

This patch breaks up the call into 1GB chunks, calling
cond_resched() inbetween to allow the scheduler to run.

Fixes: fb5924fddf ("powerpc/mm: Flush cache on memory hot(un)plug")
Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20191104023305.9581-6-alastair@au1.ibm.com

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Alastair D'Silva 2019-11-04 13:32:57 +11:00 • committed by Michael Ellerman

parent 23eb7f560a

commit 076265907c

1 changed files with 25 additions and 2 deletions

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arch/powerpc/mm/mem.c

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