UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

ceph: wait on writeback after writing snapshot data 

In sync mode, writepages() needs to write all dirty pages. But
it can only write dirty pages associated with the oldest snapc.
To write dirty pages associated with next snapc, it needs to wait
until current writes complete.

Without this wait, writepages() keeps looking up dirty pages, but
the found dirty pages are not writeable. It wastes CPU time.

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Yan, Zheng 2017-09-01 17:03:16 +08:00 committed by Ilya Dryomov
parent 7e1ee54a07
commit f275635ee0
1 changed files with 24 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
fs/ceph/addr.c
View File

@ -1165,6 +1165,30 @@ release_pvec_pages:
/* more to do; loop back to beginning of file */ /* more to do; loop back to beginning of file */
dout("writepages looping back to beginning of file\n"); dout("writepages looping back to beginning of file\n");
end = start_index - 1; /* OK even when start_index == 0 */ end = start_index - 1; /* OK even when start_index == 0 */
/* to write dirty pages associated with next snapc,
* we need to wait until current writes complete */
if (wbc->sync_mode != WB_SYNC_NONE &&
start_index == 0 && /* all dirty pages were checked */
!ceph_wbc.head_snapc) {
struct page *page;
unsigned i, nr;
index = 0;
while ((index <= end) &&
(nr = pagevec_lookup_tag(&pvec, mapping, &index,
PAGECACHE_TAG_WRITEBACK,
PAGEVEC_SIZE))) {
for (i = 0; i < nr; i++) {
page = pvec.pages[i];
if (page_snap_context(page) != snapc)
continue;
wait_on_page_writeback(page);
}
pagevec_release(&pvec);
cond_resched();
}
}
start_index = 0; start_index = 0;
index = 0; index = 0;
goto retry; goto retry;