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mm/page-writeback: introduce tracepoint for wait_on_page_writeback()

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Recently there have been some hung tasks on our server due to
wait_on_page_writeback(), and we want to know the details of this
PG_writeback, i.e.  this page is writing back to which device.  But it is
not so convenient to get the details.

I think it would be better to introduce a tracepoint for diagnosing the
writeback details.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Yafang Shao <[email protected]>
Reviewed-by: Andrew Morton <[email protected]>
Cc: Jan Kara <[email protected]>
Cc: Michal Hocko <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Yafang Shao 2019-05-13 17:23:11 -07:00 • committed by Linus Torvalds
commit 19343b5bdd
3 changed files with 28 additions and 10 deletions
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12
mm/page-writeback.c
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@ -2808,6 +2808,18 @@ int __test_set_page_writeback(struct page *page, bool keep_write)
}
EXPORT_SYMBOL(__test_set_page_writeback);
/*
* Wait for a page to complete writeback
*/
void wait_on_page_writeback(struct page *page)
{
if (PageWriteback(page)) {
trace_wait_on_page_writeback(page, page_mapping(page));
wait_on_page_bit(page, PG_writeback);
}
}
EXPORT_SYMBOL_GPL(wait_on_page_writeback);
/**
* wait_for_stable_page() - wait for writeback to finish, if necessary.
* @page: The page to wait on.