The patch titled
Subject: mm/filemap: pass a sleep state to put_and_wait_on_page_locked
has been added to the -mm tree. Its filename is
mm-filemap-pass-a-sleep-state-to-put_and_wait_on_page_locked.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-filemap-pass-a-sleep-state-to-put_and_wait_on_page_locked.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-filemap-pass-a-sleep-state-to-put_and_wait_on_page_locked.patch
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------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Subject: mm/filemap: pass a sleep state to put_and_wait_on_page_locked
This is prep work for the next patch, but I think at least one of the
current callers would prefer a killable sleep to an uninterruptible one.
Link: https://lkml.kernel.org/r/20210122160140.223228-6-willy@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Reviewed-by: Kent Overstreet <kent.overstreet@xxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Cc: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/pagemap.h | 3 +--
mm/filemap.c | 7 +++++--
mm/huge_memory.c | 4 ++--
mm/migrate.c | 4 ++--
4 files changed, 10 insertions(+), 8 deletions(-)
--- a/include/linux/pagemap.h~mm-filemap-pass-a-sleep-state-to-put_and_wait_on_page_locked
+++ a/include/linux/pagemap.h
@@ -681,8 +681,7 @@ static inline int wait_on_page_locked_ki
return wait_on_page_bit_killable(compound_head(page), PG_locked);
}
-extern void put_and_wait_on_page_locked(struct page *page);
-
+int put_and_wait_on_page_locked(struct page *page, int state);
void wait_on_page_writeback(struct page *page);
extern void end_page_writeback(struct page *page);
void wait_for_stable_page(struct page *page);
--- a/mm/filemap.c~mm-filemap-pass-a-sleep-state-to-put_and_wait_on_page_locked
+++ a/mm/filemap.c
@@ -1378,20 +1378,23 @@ static int wait_on_page_locked_async(str
/**
* put_and_wait_on_page_locked - Drop a reference and wait for it to be unlocked
* @page: The page to wait for.
+ * @state: The sleep state (TASK_KILLABLE, TASK_UNINTERRUPTIBLE, etc).
*
* The caller should hold a reference on @page. They expect the page to
* become unlocked relatively soon, but do not wish to hold up migration
* (for example) by holding the reference while waiting for the page to
* come unlocked. After this function returns, the caller should not
* dereference @page.
+ *
+ * Return: 0 if the page was unlocked or -EINTR if interrupted by a signal.
*/
-void put_and_wait_on_page_locked(struct page *page)
+int put_and_wait_on_page_locked(struct page *page, int state)
{
wait_queue_head_t *q;
page = compound_head(page);
q = page_waitqueue(page);
- wait_on_page_bit_common(q, page, PG_locked, TASK_UNINTERRUPTIBLE, DROP);
+ return wait_on_page_bit_common(q, page, PG_locked, state, DROP);
}
/**
--- a/mm/huge_memory.c~mm-filemap-pass-a-sleep-state-to-put_and_wait_on_page_locked
+++ a/mm/huge_memory.c
@@ -1439,7 +1439,7 @@ vm_fault_t do_huge_pmd_numa_page(struct
if (!get_page_unless_zero(page))
goto out_unlock;
spin_unlock(vmf->ptl);
- put_and_wait_on_page_locked(page);
+ put_and_wait_on_page_locked(page, TASK_UNINTERRUPTIBLE);
goto out;
}
@@ -1475,7 +1475,7 @@ vm_fault_t do_huge_pmd_numa_page(struct
if (!get_page_unless_zero(page))
goto out_unlock;
spin_unlock(vmf->ptl);
- put_and_wait_on_page_locked(page);
+ put_and_wait_on_page_locked(page, TASK_UNINTERRUPTIBLE);
goto out;
}
--- a/mm/migrate.c~mm-filemap-pass-a-sleep-state-to-put_and_wait_on_page_locked
+++ a/mm/migrate.c
@@ -331,7 +331,7 @@ void __migration_entry_wait(struct mm_st
if (!get_page_unless_zero(page))
goto out;
pte_unmap_unlock(ptep, ptl);
- put_and_wait_on_page_locked(page);
+ put_and_wait_on_page_locked(page, TASK_UNINTERRUPTIBLE);
return;
out:
pte_unmap_unlock(ptep, ptl);
@@ -365,7 +365,7 @@ void pmd_migration_entry_wait(struct mm_
if (!get_page_unless_zero(page))
goto unlock;
spin_unlock(ptl);
- put_and_wait_on_page_locked(page);
+ put_and_wait_on_page_locked(page, TASK_UNINTERRUPTIBLE);
return;
unlock:
spin_unlock(ptl);
_
Patches currently in -mm which might be from willy@xxxxxxxxxxxxx are
mm-debug-improve-memcg-debugging.patch
mm-filemap-rename-generic_file_buffered_read-subfunctions.patch
mm-filemap-remove-dynamically-allocated-array-from-filemap_read.patch
mm-filemap-convert-filemap_get_pages-to-take-a-pagevec.patch
mm-filemap-use-head-pages-in-generic_file_buffered_read.patch
mm-filemap-pass-a-sleep-state-to-put_and_wait_on_page_locked.patch
mm-filemap-support-readpage-splitting-a-page.patch
mm-filemap-inline-__wait_on_page_locked_async-into-caller.patch
mm-filemap-dont-call-readpage-if-iocb_waitq-is-set.patch
mm-filemap-change-filemap_read_page-calling-conventions.patch
mm-filemap-change-filemap_create_page-calling-conventions.patch
mm-filemap-convert-filemap_update_page-to-return-an-errno.patch
mm-filemap-move-the-iocb-checks-into-filemap_update_page.patch
mm-filemap-add-filemap_range_uptodate.patch
mm-filemap-split-filemap_readahead-out-of-filemap_get_pages.patch
mm-filemap-restructure-filemap_get_pages.patch
mm-filemap-dont-relock-the-page-after-calling-readpage.patch
mm-make-pagecache-tagged-lookups-return-only-head-pages.patch
mm-shmem-use-pagevec_lookup-in-shmem_unlock_mapping.patch
mm-swap-optimise-get_shadow_from_swap_cache.patch
mm-add-fgp_entry.patch
mm-filemap-rename-find_get_entry-to-mapping_get_entry.patch
mm-filemap-add-helper-for-finding-pages.patch
mm-filemap-add-helper-for-finding-pages-fix.patch
mm-filemap-add-mapping_seek_hole_data.patch
mm-filemap-add-mapping_seek_hole_data-fix.patch
iomap-use-mapping_seek_hole_data.patch
mm-add-and-use-find_lock_entries.patch
mm-add-and-use-find_lock_entries-fix.patch
mm-add-an-end-parameter-to-find_get_entries.patch
mm-add-an-end-parameter-to-pagevec_lookup_entries.patch
mm-remove-nr_entries-parameter-from-pagevec_lookup_entries.patch
mm-pass-pvec-directly-to-find_get_entries.patch
mm-remove-pagevec_lookup_entries.patch
