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Message-ID: <20240706045641.631961-15-senozhatsky@chromium.org>
Date: Sat, 6 Jul 2024 13:56:16 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: Andrew Morton <akpm@...ux-foundation.org>,
Minchan Kim <minchan@...nel.org>
Cc: linux-kernel@...r.kernel.org,
Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: [PATCHv5 14/23] zram: recalculate zstd compression params once
zstd compression params depends on level, but are constant
for a given instance of zstd compression backend. Calculate
once (during ctx creation).
Signed-off-by: Sergey Senozhatsky <senozhatsky@...omium.org>
---
drivers/block/zram/backend_zstd.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/block/zram/backend_zstd.c b/drivers/block/zram/backend_zstd.c
index 2328a462b82c..a9808abcf5f2 100644
--- a/drivers/block/zram/backend_zstd.c
+++ b/drivers/block/zram/backend_zstd.c
@@ -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;
--
2.45.2.803.g4e1b14247a-goog
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