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| author | Johannes Berg <johannes.berg@intel.com> | 2021-03-15 23:38:04 +0100 |
|---|---|---|
| committer | Richard Weinberger <richard@nod.at> | 2021-06-17 22:04:40 +0200 |
| commit | 80f849bf541ef9b633a9c08ac208f9c9afd14eb9 (patch) | |
| tree | 4da4171a7d84405ecdbecfc246301eb9e176f9da /arch/um/drivers/ubd_kern.c | |
| parent | dd3035a21ba7ccaa883d7107d357ad06320d78fc (diff) | |
um: implement flush_cache_vmap/flush_cache_vunmap
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>
Diffstat (limited to 'arch/um/drivers/ubd_kern.c')
0 files changed, 0 insertions, 0 deletions