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zram: recalculate zstd compression params once

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zstd compression params depends on level, but are constant for a given
instance of zstd compression backend.  Calculate once (during ctx
creation).

Link: https://lkml.kernel.org/r/20240902105656.1383858-15-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 19:56:02 +09:00 committed by Andrew Morton
parent f2bac7ad18
commit eb826a0190
1 changed files with 3 additions and 2 deletions
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5
drivers/block/zram/backend_zstd.c
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@ -10,6 +10,7 @@
struct zstd_ctx {
zstd_cctx *cctx;
zstd_dctx *dctx;
zstd_parameters cprm;
void *cctx_mem;
void *dctx_mem;
s32 level;
@ -40,6 +41,7 @@ static void *zstd_create(struct zcomp_params *params)
ctx->level = zstd_default_clevel();
prm = zstd_get_params(ctx->level, PAGE_SIZE);
ctx->cprm = zstd_get_params(ctx->level, PAGE_SIZE);
sz = zstd_cctx_workspace_bound(&prm.cParams);
ctx->cctx_mem = vzalloc(sz);
if (!ctx->cctx_mem)
@ -69,11 +71,10 @@ 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 prm = zstd_get_params(zctx->level, PAGE_SIZE);
size_t ret;
ret = zstd_compress_cctx(zctx->cctx, dst, *dst_len,
src, src_len, &prm);
src, src_len, &zctx->cprm);
if (zstd_is_error(ret))
return -EINVAL;
*dst_len = ret;