diff options
| author | Mateusz Guzik <[email protected]> | 2022-05-04 20:46:37 +0200 |
|---|---|---|
| committer | GitHub <[email protected]> | 2022-05-04 11:46:37 -0700 |
| commit | 81b8b2d004442c3e7f196d61c2ae8eed02712b6c (patch) | |
| tree | 94d570e88227270cc675aab82f4041b86beb3127 /module | |
| parent | a894ae75b817631e49cf8a23f3f9b432bd31296e (diff) | |
FreeBSD: use zero_region instead of allocating a dedicated page
Reviewed-by: Alexander Motin <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: Brian Atkinson <[email protected]>
Signed-off-by: Mateusz Guzik <[email protected]>
Closes #13406
Diffstat (limited to 'module')
| -rw-r--r-- | module/os/freebsd/zfs/abd_os.c | 10 |
1 files changed, 3 insertions, 7 deletions
diff --git a/module/os/freebsd/zfs/abd_os.c b/module/os/freebsd/zfs/abd_os.c index 5d2bae5cf..58a37df62 100644 --- a/module/os/freebsd/zfs/abd_os.c +++ b/module/os/freebsd/zfs/abd_os.c @@ -113,7 +113,6 @@ static kstat_t *abd_ksp; * memory by only using a single zero buffer for the scatter chunks. */ abd_t *abd_zero_scatter = NULL; -static char *abd_zero_buf = NULL; static uint_t abd_chunkcnt_for_bytes(size_t size) @@ -241,18 +240,16 @@ abd_free_struct_impl(abd_t *abd) /* * Allocate scatter ABD of size SPA_MAXBLOCKSIZE, where - * each chunk in the scatterlist will be set to abd_zero_buf. + * each chunk in the scatterlist will be set to the same area. */ +_Static_assert(ZERO_REGION_SIZE >= PAGE_SIZE, "zero_region too small"); static void abd_alloc_zero_scatter(void) { uint_t i, n; n = abd_chunkcnt_for_bytes(SPA_MAXBLOCKSIZE); - abd_zero_buf = kmem_cache_alloc(abd_chunk_cache, KM_PUSHPAGE); - memset(abd_zero_buf, 0, PAGE_SIZE); abd_zero_scatter = abd_alloc_struct(SPA_MAXBLOCKSIZE); - abd_zero_scatter->abd_flags |= ABD_FLAG_OWNER | ABD_FLAG_ZEROS; abd_zero_scatter->abd_size = SPA_MAXBLOCKSIZE; @@ -260,7 +257,7 @@ abd_alloc_zero_scatter(void) for (i = 0; i < n; i++) { ABD_SCATTER(abd_zero_scatter).abd_chunks[i] = - abd_zero_buf; + __DECONST(void *, zero_region); } ABDSTAT_BUMP(abdstat_scatter_cnt); @@ -275,7 +272,6 @@ abd_free_zero_scatter(void) abd_free_struct(abd_zero_scatter); abd_zero_scatter = NULL; - kmem_cache_free(abd_chunk_cache, abd_zero_buf); } static int |