github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-30 01:53:29 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

btrfs: zstd: move zstd_parameters to the workspace

Browse Source 
Reduce stack consumption of zstd_compress_folios() by 40 bytes
(10*sizeof(int)) as we can store struct zstd_parameters in the workspace
that is reused for each call.

typedef struct {
	ZSTD_compressionParameters cParams;
	ZSTD_frameParameters fParams;
} ZSTD_parameters;

typedef struct {
    unsigned windowLog;
    unsigned chainLog;
    unsigned hashLog;
    unsigned searchLog;
    unsigned minMatch;
    unsigned targetLength;
    ZSTD_strategy strategy;
} ZSTD_compressionParameters;

typedef struct {
    int contentSizeFlag;
    int checksumFlag;
    int noDictIDFlag;
} ZSTD_frameParameters;

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2025-02-12 21:22:02 +01:00
parent a8511baf32
commit cfb999b81a
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
fs/btrfs/zstd.c
View File

@ -53,6 +53,7 @@ struct workspace {
struct list_head lru_list;
zstd_in_buffer in_buf;
zstd_out_buffer out_buf;
zstd_parameters params;
};
/*
@ -402,15 +403,14 @@ int zstd_compress_folios(struct list_head *ws, struct address_space *mapping,
unsigned long max_out = nr_dest_folios * PAGE_SIZE;
unsigned int pg_off;
unsigned int cur_len;
zstd_parameters params = zstd_get_btrfs_parameters(workspace->req_level,
len);
workspace->params = zstd_get_btrfs_parameters(workspace->req_level, len);
*out_folios = 0;
*total_out = 0;
*total_in = 0;
/* Initialize the stream */
stream = zstd_init_cstream(&params, len, workspace->mem,
stream = zstd_init_cstream(&workspace->params, len, workspace->mem,
workspace->size);
if (unlikely(!stream)) {
struct btrfs_inode *inode = BTRFS_I(mapping->host);