The patch titled
Subject: dax: account DAX entries as nrpages
has been added to the -mm tree. Its filename is
dax-account-dax-entries-as-nrpages.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/dax-account-dax-entries-as-nrpages.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/dax-account-dax-entries-as-nrpages.patch
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------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Subject: dax: account DAX entries as nrpages
Simplify mapping_needs_writeback() by accounting DAX entries as pages
instead of exceptional entries.
Link: https://lkml.kernel.org/r/20201026151849.24232-4-willy@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Tested-by: Vishal Verma <vishal.l.verma@xxxxxxxxx>
Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/dax.c | 6 +++---
mm/filemap.c | 3 ---
2 files changed, 3 insertions(+), 6 deletions(-)
--- a/fs/dax.c~dax-account-dax-entries-as-nrpages
+++ a/fs/dax.c
@@ -525,7 +525,7 @@ retry:
dax_disassociate_entry(entry, mapping, false);
xas_store(xas, NULL); /* undo the PMD join */
dax_wake_entry(xas, entry, true);
- mapping->nrexceptional--;
+ mapping->nrpages -= PG_PMD_NR;
entry = NULL;
xas_set(xas, index);
}
@@ -541,7 +541,7 @@ retry:
dax_lock_entry(xas, entry);
if (xas_error(xas))
goto out_unlock;
- mapping->nrexceptional++;
+ mapping->nrpages += 1UL << order;
}
out_unlock:
@@ -661,7 +661,7 @@ static int __dax_invalidate_entry(struct
goto out;
dax_disassociate_entry(entry, mapping, trunc);
xas_store(&xas, NULL);
- mapping->nrexceptional--;
+ mapping->nrpages -= 1UL << dax_entry_order(entry);
ret = 1;
out:
put_unlocked_entry(&xas, entry);
--- a/mm/filemap.c~dax-account-dax-entries-as-nrpages
+++ a/mm/filemap.c
@@ -618,9 +618,6 @@ EXPORT_SYMBOL(filemap_fdatawait_keep_err
/* Returns true if writeback might be needed or already in progress. */
static bool mapping_needs_writeback(struct address_space *mapping)
{
- if (dax_mapping(mapping))
- return mapping->nrexceptional;
-
return mapping->nrpages;
}
_
Patches currently in -mm which might be from willy@xxxxxxxxxxxxx are
mm-filemap-use-filemap_read_page-in-filemap_fault.patch
mm-filemap-drop-check-for-truncated-page-after-i-o.patch
mm-introduce-and-use-mapping_empty.patch
mm-stop-accounting-shadow-entries.patch
dax-account-dax-entries-as-nrpages.patch
mm-remove-nrexceptional-from-inode.patch
mm-page_alloc-rename-alloc_mask-to-alloc_gfp.patch
mm-page_alloc-rename-gfp_mask-to-gfp.patch
mm-page_alloc-combine-__alloc_pages-and-__alloc_pages_nodemask.patch
mm-mempolicy-rename-alloc_pages_current-to-alloc_pages.patch
mm-mempolicy-rewrite-alloc_pages-documentation.patch
mm-mempolicy-rewrite-alloc_pages_vma-documentation.patch
mm-mempolicy-fix-mpol_misplaced-kernel-doc.patch
include-remove-pagemaph-from-blkdevh.patch
