kernel/linux.git/drivers/block/zram/zcomp.c, branch v6.12.91

zram: move immutable comp params away from per-CPU context

2024-09-09T23:39:10+00:00

Immutable params never change once comp has been allocated and setup, so we don't need to store multiple copies of them in each per-CPU backend context. Move those to per-comp zcomp_params and pass it to backends callbacks for requests execution. Basically, this means parameters sharing between different contexts. Also introduce two new backends callbacks: setup_params() and release_params(). First, we need to validate params in a driver-specific way; second, driver may want to allocate its specific representation of the params which is needed to execute requests. Link: https://lkml.kernel.org/r/20240902105656.1383858-20-senozhatsky@chromium.org Signed-off-by: Sergey Senozhatsky Cc: Minchan Kim Cc: Nick Terrell Signed-off-by: Andrew Morton

zram: introduce zcomp_ctx structure

2024-09-09T23:39:10+00:00

Keep run-time driver data (scratch buffers, etc.) in zcomp_ctx structure. This structure is allocated per-CPU because drivers (backends) need to modify its content during requests execution. We will split mutable and immutable driver data, this is a preparation path. Link: https://lkml.kernel.org/r/20240902105656.1383858-19-senozhatsky@chromium.org Signed-off-by: Sergey Senozhatsky Cc: Minchan Kim Cc: Nick Terrell Signed-off-by: Andrew Morton

zram: introduce zcomp_req structure

2024-09-09T23:39:10+00:00

Encapsulate compression/decompression data in zcomp_req structure. Link: https://lkml.kernel.org/r/20240902105656.1383858-18-senozhatsky@chromium.org Signed-off-by: Sergey Senozhatsky Cc: Minchan Kim Cc: Nick Terrell Signed-off-by: Andrew Morton

zram: introduce zcomp_params structure

2024-09-09T23:39:09+00:00

We will store a per-algorithm parameters there (compression level, dictionary, dictionary size, etc.). Link: https://lkml.kernel.org/r/20240902105656.1383858-14-senozhatsky@chromium.org Signed-off-by: Sergey Senozhatsky Cc: Minchan Kim Cc: Nick Terrell Signed-off-by: Andrew Morton

zram: check that backends array has at least one backend

2024-09-09T23:39:09+00:00

Make sure that backends array has anything apart from the sentinel NULL value. We also select LZO_BACKEND if none backends were selected. Link: https://lkml.kernel.org/r/20240902105656.1383858-13-senozhatsky@chromium.org Signed-off-by: Sergey Senozhatsky Cc: Minchan Kim Cc: Nick Terrell Signed-off-by: Andrew Morton

zram: add 842 compression backend support

2024-09-09T23:39:08+00:00

Add s/w 842 compression support. Link: https://lkml.kernel.org/r/20240902105656.1383858-12-senozhatsky@chromium.org Signed-off-by: Sergey Senozhatsky Cc: Minchan Kim Cc: Nick Terrell Signed-off-by: Andrew Morton

zram: add zlib compression backend support

2024-09-09T23:39:08+00:00

Add s/w zlib (inflate/deflate) compression. Link: https://lkml.kernel.org/r/20240902105656.1383858-11-senozhatsky@chromium.org Signed-off-by: Sergey Senozhatsky Cc: Minchan Kim Cc: Nick Terrell Signed-off-by: Andrew Morton

zram: add zstd compression backend support

2024-09-09T23:39:08+00:00

Add s/w zstd compression. Link: https://lkml.kernel.org/r/20240902105656.1383858-9-senozhatsky@chromium.org Signed-off-by: Sergey Senozhatsky Cc: Minchan Kim Cc: Nick Terrell Signed-off-by: Andrew Morton

zram: add lz4hc compression backend support

2024-09-09T23:39:07+00:00

Add s/w lz4hc compression support. Link: https://lkml.kernel.org/r/20240902105656.1383858-8-senozhatsky@chromium.org Signed-off-by: Sergey Senozhatsky Cc: Minchan Kim Cc: Nick Terrell Signed-off-by: Andrew Morton

zram: add lz4 compression backend support

2024-09-09T23:39:07+00:00

Add s/w lz4 compression support. Link: https://lkml.kernel.org/r/20240902105656.1383858-7-senozhatsky@chromium.org Signed-off-by: Sergey Senozhatsky Cc: Minchan Kim Cc: Nick Terrell Signed-off-by: Andrew Morton