kernel/arch/um/include/asm/cacheflush.h, branch linux-rolling-stableHosts the 0x221E linux distro kernel.https://universe.0xinfinity.dev/distro/kernel/atom?h=linux-rolling-stable2021-06-17T20:04:40Zum: implement flush_cache_vmap/flush_cache_vunmap2021-06-17T20:04:40ZJohannes Bergjohannes.berg@intel.com2021-03-15T22:38:04Zurn:sha1:80f849bf541ef9b633a9c08ac208f9c9afd14eb9
vmalloc() heavy workloads in UML are extremely slow, due to
flushing the entire kernel VM space (flush_tlb_kernel_vm())
on the first segfault.
Implement flush_cache_vmap() to avoid that, and while at it
also add flush_cache_vunmap() since it's trivial.
This speeds up my vmalloc() heavy test of copying files out
from /sys/kernel/debug/gcov/ by 30x (from 30s to 1s.)
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Acked-By: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Signed-off-by: Richard Weinberger <richard@nod.at>