The quilt patch titled
Subject: zram: recalculate zstd compression params once
has been removed from the -mm tree. Its filename was
zram-recalculate-zstd-compression-params-once.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
Subject: zram: recalculate zstd compression params once
Date: Mon, 2 Sep 2024 19:56:02 +0900
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@xxxxxxxxxxxx
Signed-off-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Nick Terrell <terrelln@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/block/zram/backend_zstd.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/drivers/block/zram/backend_zstd.c~zram-recalculate-zstd-compression-params-once
+++ a/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_pa
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, cons
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;
_
Patches currently in -mm which might be from senozhatsky@xxxxxxxxxxxx are
zsmalloc-use-unique-zsmalloc-caches-names.patch
