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.
Signed-off-by: Sergey Senozhatsky <[email protected]>
---
drivers/block/zram/backend_zstd.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/block/zram/backend_zstd.c b/drivers/block/zram/backend_zstd.c
index bfe836844232..f930e9828be2 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,
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,
--
2.45.0.rc1.225.g2a3ae87e7f-goog