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| author | Sergey Senozhatsky <senozhatsky@chromium.org> | 2024-09-02 12:55:57 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-09-10 01:39:08 +0200 |
| commit | dbf2763cec21f4e56420c3a31bf6f0ebf81b5ab7 (patch) | |
| tree | cf2b88a4544284ff38e81f09676354507772c68d /drivers/block | |
| parent | zram: add zstd compression backend support (diff) | |
| download | linux-dbf2763cec21f4e56420c3a31bf6f0ebf81b5ab7.tar.xz linux-dbf2763cec21f4e56420c3a31bf6f0ebf81b5ab7.zip | |
zram: pass estimated src size hint to zstd
zram works with PAGE_SIZE buffers, so we always know exact size of the
source buffer and hence can pass estimated_src_size to zstd_get_params().
This hint on x86_64, for example, reduces the size of the work memory
buffer from 1303520 bytes down to 90080 bytes. Given that compression
streams are per-CPU that's quite some memory saving.
Link: https://lkml.kernel.org/r/20240902105656.1383858-10-senozhatsky@chromium.org
Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nick Terrell <terrelln@fb.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/zram/backend_zstd.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/block/zram/backend_zstd.c b/drivers/block/zram/backend_zstd.c index abec68d1104b..310d970078e2 100644 --- a/drivers/block/zram/backend_zstd.c +++ b/drivers/block/zram/backend_zstd.c @@ -35,7 +35,7 @@ static void *zstd_create(void) return NULL; ctx->level = zstd_default_clevel(); - params = zstd_get_params(ctx->level, 0); + params = zstd_get_params(ctx->level, PAGE_SIZE); sz = zstd_cctx_workspace_bound(¶ms.cParams); ctx->cctx_mem = vzalloc(sz); if (!ctx->cctx_mem) @@ -65,7 +65,7 @@ static int zstd_compress(void *ctx, const unsigned char *src, size_t src_len, unsigned char *dst, size_t *dst_len) { struct zstd_ctx *zctx = ctx; - const zstd_parameters params = zstd_get_params(zctx->level, 0); + const zstd_parameters params = zstd_get_params(zctx->level, PAGE_SIZE); size_t ret; ret = zstd_compress_cctx(zctx->cctx, dst, *dst_len, |