d04a7ec191
Currently, the squashfs multi_cpu decompressor makes use of get_cpu_ptr()/put_cpu_ptr(), which unconditionally disable preemption during decompression. Because the workload is distributed across CPUs, all CPUs can observe a very high wakeup latency, which has been seen to be as much as 8000us. Convert this decompressor to make use of a local lock, which will allow execution of the decompressor with preemption-enabled, but also ensure concurrent accesses to the percpu compressor data on the local CPU will be serialized. Cc: stable-rt@vger.kernel.org Reported-by: Alexander Stein <alexander.stein@systec-electronic.com> Tested-by: Alexander Stein <alexander.stein@systec-electronic.com> Signed-off-by: Julia Cartwright <julia@ni.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> |
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.. | ||
block.c | ||
cache.c | ||
decompressor_multi_percpu.c | ||
decompressor_multi.c | ||
decompressor_single.c | ||
decompressor.c | ||
decompressor.h | ||
dir.c | ||
export.c | ||
file_cache.c | ||
file_direct.c | ||
file.c | ||
fragment.c | ||
id.c | ||
inode.c | ||
Kconfig | ||
lz4_wrapper.c | ||
lzo_wrapper.c | ||
Makefile | ||
namei.c | ||
page_actor.c | ||
page_actor.h | ||
squashfs_fs_i.h | ||
squashfs_fs_sb.h | ||
squashfs_fs.h | ||
squashfs.h | ||
super.c | ||
symlink.c | ||
xattr_id.c | ||
xattr.c | ||
xattr.h | ||
xz_wrapper.c | ||
zlib_wrapper.c | ||
zstd_wrapper.c |