Archive-Team
/
zfs
2
0
Fork 0
Code Issues Pull Requests Packages Projects Releases 103 Wiki Activity

Skip memory allocation when compressing holes 

Hole detection in the zio compression code allows us to
opportunistically skip compression on holes. We can go a step further
by not doing memory allocations on holes either.

Reviewed-by: Brian Atkinson <batkinson@lanl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Richard Yao <richard.yao@klarasystems.com>
Sponsored-by: Wasabi Technology, Inc.
Closes #14500
This commit is contained in:
Richard Yao 2023-02-27 17:41:02 -05:00 committed by GitHub
parent f58e513f74
commit bff26b0220
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 23 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/sys/zio_compress.h
View File

@ -183,7 +183,7 @@ extern int lz4_decompress_zfs(void *src, void *dst, size_t s_len, size_t d_len,
/*
* Compress and decompress data if necessary.
*/
extern size_t zio_compress_data(enum zio_compress c, abd_t *src, void *dst,
extern size_t zio_compress_data(enum zio_compress c, abd_t *src, void **dst,
size_t s_len, uint8_t level);
extern int zio_decompress_data(enum zio_compress c, abd_t *src, void *dst,
size_t s_len, size_t d_len, uint8_t *level);

16
module/zfs/arc.c
View File

@ -1816,12 +1816,13 @@ arc_hdr_authenticate(arc_buf_hdr_t *hdr, spa_t *spa, uint64_t dsobj)
*/
if (HDR_GET_COMPRESS(hdr) != ZIO_COMPRESS_OFF &&
!HDR_COMPRESSION_ENABLED(hdr)) {
tmpbuf = zio_buf_alloc(lsize);
csize = zio_compress_data(HDR_GET_COMPRESS(hdr),
hdr->b_l1hdr.b_pabd, &tmpbuf, lsize, hdr->b_complevel);
ASSERT3P(tmpbuf, !=, NULL);
ASSERT3U(csize, <=, psize);
abd = abd_get_from_buf(tmpbuf, lsize);
abd_take_ownership_of_buf(abd, B_TRUE);
csize = zio_compress_data(HDR_GET_COMPRESS(hdr),
hdr->b_l1hdr.b_pabd, tmpbuf, lsize, hdr->b_complevel);
ASSERT3U(csize, <=, psize);
abd_zero_off(abd, csize, psize - csize);
}
@ -9402,7 +9403,7 @@ l2arc_apply_transforms(spa_t *spa, arc_buf_hdr_t *hdr, uint64_t asize,
cabd = abd_alloc_for_io(size, ismd);
tmp = abd_borrow_buf(cabd, size);
psize = zio_compress_data(compress, to_write, tmp, size,
psize = zio_compress_data(compress, to_write, &tmp, size,
hdr->b_complevel);
if (psize >= asize) {
@ -10867,12 +10868,11 @@ l2arc_log_blk_commit(l2arc_dev_t *dev, zio_t *pio, l2arc_write_callback_t *cb)
uint64_t psize, asize;
zio_t *wzio;
l2arc_lb_abd_buf_t *abd_buf;
uint8_t *tmpbuf;
uint8_t *tmpbuf = NULL;
l2arc_lb_ptr_buf_t *lb_ptr_buf;
VERIFY3S(dev->l2ad_log_ent_idx, ==, dev->l2ad_log_entries);
tmpbuf = zio_buf_alloc(sizeof (*lb));
abd_buf = zio_buf_alloc(sizeof (*abd_buf));
abd_buf->abd = abd_get_from_buf(lb, sizeof (*lb));
lb_ptr_buf = kmem_zalloc(sizeof (l2arc_lb_ptr_buf_t), KM_SLEEP);
@ -10891,7 +10891,7 @@ l2arc_log_blk_commit(l2arc_dev_t *dev, zio_t *pio, l2arc_write_callback_t *cb)
/* try to compress the buffer */
psize = zio_compress_data(ZIO_COMPRESS_LZ4,
abd_buf->abd, tmpbuf, sizeof (*lb), 0);
abd_buf->abd, (void **) &tmpbuf, sizeof (*lb), 0);
/* a log block is never entirely zero */
ASSERT(psize != 0);

3
module/zfs/dmu_recv.c
View File

@ -1398,8 +1398,9 @@ do_corrective_recv(struct receive_writer_arg *rwa, struct drr_write *drrw,
/* Recompress the data */
abd_t *cabd = abd_alloc_linear(BP_GET_PSIZE(bp),
B_FALSE);
void *buf = abd_to_buf(cabd);
uint64_t csize = zio_compress_data(BP_GET_COMPRESS(bp),
abd, abd_to_buf(cabd), abd_get_size(abd),
abd, &buf, abd_get_size(abd),
rwa->os->os_complevel);
abd_zero_off(cabd, csize, BP_GET_PSIZE(bp) - csize);
/* Swap in newly compressed data into the abd */

11
module/zfs/zio.c
View File

@ -1704,12 +1704,15 @@ zio_write_compress(zio_t *zio)
/* If it's a compressed write that is not raw, compress the buffer. */
if (compress != ZIO_COMPRESS_OFF &&
!(zio->io_flags & ZIO_FLAG_RAW_COMPRESS)) {
void *cbuf = zio_buf_alloc(lsize);
psize = zio_compress_data(compress, zio->io_abd, cbuf, lsize,
void *cbuf = NULL;
psize = zio_compress_data(compress, zio->io_abd, &cbuf, lsize,
zp->zp_complevel);
if (psize == 0 || psize >= lsize) {
if (psize == 0) {
compress = ZIO_COMPRESS_OFF;
zio_buf_free(cbuf, lsize);
} else if (psize >= lsize) {
compress = ZIO_COMPRESS_OFF;
if (cbuf != NULL)
zio_buf_free(cbuf, lsize);
} else if (!zp->zp_dedup && !zp->zp_encrypt &&
psize <= BPE_PAYLOAD_SIZE &&
zp->zp_level == 0 && !DMU_OT_HAS_FILL(zp->zp_type) &&

7
module/zfs/zio_compress.c
View File

@ -125,7 +125,7 @@ zio_compress_zeroed_cb(void *data, size_t len, void *private)
}
size_t
zio_compress_data(enum zio_compress c, abd_t *src, void *dst, size_t s_len,
zio_compress_data(enum zio_compress c, abd_t *src, void **dst, size_t s_len,
uint8_t level)
{
size_t c_len, d_len;
@ -163,9 +163,12 @@ zio_compress_data(enum zio_compress c, abd_t *src, void *dst, size_t s_len,
ASSERT3U(complevel, !=, ZIO_COMPLEVEL_INHERIT);
}
if (*dst == NULL)
*dst = zio_buf_alloc(s_len);
/* No compression algorithms can read from ABDs directly */
void *tmp = abd_borrow_buf_copy(src, s_len);
c_len = ci->ci_compress(tmp, dst, s_len, d_len, complevel);
c_len = ci->ci_compress(tmp, *dst, s_len, d_len, complevel);
abd_return_buf(src, tmp, s_len);
if (c_len > d_len)