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zram: pass estimated src size hint to zstd

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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>
This commit is contained in:
Sergey Senozhatsky
2024-09-02 19:55:57 +09:00
committed by Andrew Morton
parent 73e7d81abb
commit dbf2763cec
1 changed files with 2 additions and 2 deletions
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drivers/block/zram/backend_zstd.c
+2 -2
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@@ -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(&params.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,