From: Ming Lei <tom.leiming@gmail.com>
To: Shaohua Li <shli@kernel.org>, Jens Axboe <axboe@fb.com>,
linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org,
linux-block@vger.kernel.org,
Christoph Hellwig <hch@infradead.org>, NeilBrown <neilb@suse.com>
Cc: Ming Lei <tom.leiming@gmail.com>
Subject: [PATCH 14/17] md: raid10: avoid direct access to bvec table in sync_request_write()
Date: Thu, 16 Feb 2017 19:45:44 +0800 [thread overview]
Message-ID: <1487245547-24384-15-git-send-email-tom.leiming@gmail.com> (raw)
In-Reply-To: <1487245547-24384-1-git-send-email-tom.leiming@gmail.com>
The cost is 256bytes(8*16*2) stack space, and just use the bio
helper to retrieve pages from bio.
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
---
drivers/md/raid10.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 5c698f3d3083..69fe2a3cef89 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -2036,6 +2036,8 @@ static void sync_request_write(struct mddev *mddev, struct r10bio *r10_bio)
int i, first;
struct bio *tbio, *fbio;
int vcnt;
+ struct bio_vec *bvl;
+ struct page *fbio_pages[RESYNC_PAGES], *tbio_pages[RESYNC_PAGES];
atomic_set(&r10_bio->remaining, 1);
@@ -2052,6 +2054,10 @@ static void sync_request_write(struct mddev *mddev, struct r10bio *r10_bio)
fbio->bi_iter.bi_size = r10_bio->sectors << 9;
fbio->bi_iter.bi_idx = 0;
+ /* the bio has been filled up in raid10_sync_request */
+ bio_for_each_segment_all(bvl, fbio, i)
+ fbio_pages[i] = bvl->bv_page;
+
vcnt = (r10_bio->sectors + (PAGE_SIZE >> 9) - 1) >> (PAGE_SHIFT - 9);
/* now find blocks with errors */
for (i=0 ; i < conf->copies ; i++) {
@@ -2072,12 +2078,17 @@ static void sync_request_write(struct mddev *mddev, struct r10bio *r10_bio)
* All vec entries are PAGE_SIZE;
*/
int sectors = r10_bio->sectors;
+
+ /* the bio has been filled up in raid10_sync_request */
+ bio_for_each_segment_all(bvl, tbio, j)
+ tbio_pages[j] = bvl->bv_page;
+
for (j = 0; j < vcnt; j++) {
int len = PAGE_SIZE;
if (sectors < (len / 512))
len = sectors * 512;
- if (memcmp(page_address(fbio->bi_io_vec[j].bv_page),
- page_address(tbio->bi_io_vec[j].bv_page),
+ if (memcmp(page_address(fbio_pages[j]),
+ page_address(tbio_pages[j]),
len))
break;
sectors -= len/512;
--
2.7.4
next prev parent reply other threads:[~2017-02-16 11:46 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-16 11:45 [PATCH 00/17] md: cleanup on direct access to bvec table Ming Lei
2017-02-16 11:45 ` [PATCH 01/17] block: introduce bio_segments_all() Ming Lei
2017-02-16 11:45 ` [PATCH 02/17] block: introduce bio_remove_last_page() Ming Lei
2017-02-16 12:08 ` Johannes Thumshirn
2017-02-16 13:30 ` Ming Lei
2017-02-16 13:40 ` Johannes Thumshirn
2017-02-16 13:59 ` Ming Lei
2017-02-16 14:10 ` Johannes Thumshirn
2017-02-16 11:45 ` [PATCH 03/17] md: raid1/raid10: use bio_remove_last_page() Ming Lei
2017-02-16 11:45 ` [PATCH 04/17] md: introduce helpers for dealing with fetch/store preallocated pages in bio Ming Lei
2017-02-16 11:45 ` [PATCH 05/17] md: raid1/raid10: use the introduced helpers Ming Lei
2017-02-16 11:45 ` [PATCH 06/17] md: raid1/raid10: borrow .bi_error as pre-allocated page index Ming Lei
2017-02-16 11:45 ` [PATCH 07/17] md: raid1/raid10: don't use .bi_vcnt to check if all pages are added Ming Lei
2017-02-16 11:45 ` [PATCH 08/17] md: raid1: simplify r1buf_pool_free() Ming Lei
2017-02-16 11:45 ` [PATCH 09/17] md: raid1/raid10: use bio helper in *_pool_free Ming Lei
2017-02-16 11:45 ` [PATCH 10/17] md: raid1: remove direct access to bvec table in fix_sync_read_error Ming Lei
2017-02-16 11:45 ` [PATCH 11/17] md: raid1: use bio helper in process_checks() Ming Lei
2017-02-16 11:45 ` [PATCH 12/17] md: raid1: avoid direct access to bvec table " Ming Lei
2017-02-17 8:33 ` kbuild test robot
2017-02-16 11:45 ` [PATCH 13/17] md: raid1: use bio_segments_all() Ming Lei
2017-02-16 12:35 ` Johannes Thumshirn
2017-02-16 13:32 ` Ming Lei
2017-02-16 13:34 ` Johannes Thumshirn
2017-02-16 13:38 ` Ming Lei
2017-02-16 11:45 ` Ming Lei [this message]
2017-02-16 11:45 ` [PATCH 15/17] md: raid10: avoid direct access to bvec table in fix_recovery_read_error Ming Lei
2017-02-16 11:45 ` [PATCH 16/17] md: raid10: avoid direct access to bvec table in reshape_request Ming Lei
2017-02-16 11:45 ` [PATCH 17/17] md: raid10: avoid direct access to bvec table in handle_reshape_read_error Ming Lei
2017-02-16 22:16 ` [PATCH 00/17] md: cleanup on direct access to bvec table Shaohua Li
2017-02-17 1:25 ` Ming Lei
2017-02-17 4:16 ` Shaohua Li
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