+ mm-make-lock_folio_maybe_drop_mmap-vma-lock-aware.patch added to mm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm: make lock_folio_maybe_drop_mmap() VMA lock aware
has been added to the -mm mm-unstable branch.  Its filename is
     mm-make-lock_folio_maybe_drop_mmap-vma-lock-aware.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-make-lock_folio_maybe_drop_mmap-vma-lock-aware.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Subject: mm: make lock_folio_maybe_drop_mmap() VMA lock aware
Date: Wed, 27 Sep 2023 06:24:59 +0100

Patch series "Handle more faults under the VMA lock".

At this point, we're handling the majority of file-backed page faults
under the VMA lock, using the ->map_pages entry point.  This patch set
attempts to expand that for the following siutations:

 - We have to do a read.  This could be because we've hit the point in
   the readahead window where we need to kick off the next readahead,
   or because the page is simply not present in cache.
 - We're handling a write fault.  Most applications don't do I/O by writes
   to shared mmaps for very good reasons, but some do, and it'd be nice
   to not make that slow unnecessarily.
 - We're doing a COW of a private mapping (both PTE already present
   and PTE not-present).  These are two different codepaths and I handle
   both of them in this patch set.

There is no support in this patch set for drivers to mark themselves as
being VMA lock friendly; they could implement the ->map_pages
vm_operation, but if they do, they would be the first.  This is probably
something we want to change at some point in the future, and I've marked
where to make that change in the code.


This patch (of 6):

Drop the VMA lock instead of the mmap_lock if that's the one which is
held.

Link: https://lkml.kernel.org/r/20230927052505.2855872-1-willy@infradead.org
Link: https://lkml.kernel.org/r/20230927052505.2855872-2-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/filemap.c |   13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

--- a/mm/filemap.c~mm-make-lock_folio_maybe_drop_mmap-vma-lock-aware
+++ a/mm/filemap.c
@@ -3090,7 +3090,7 @@ static int lock_folio_maybe_drop_mmap(st
 
 	/*
 	 * NOTE! This will make us return with VM_FAULT_RETRY, but with
-	 * the mmap_lock still held. That's how FAULT_FLAG_RETRY_NOWAIT
+	 * the fault lock still held. That's how FAULT_FLAG_RETRY_NOWAIT
 	 * is supposed to work. We have way too many special cases..
 	 */
 	if (vmf->flags & FAULT_FLAG_RETRY_NOWAIT)
@@ -3100,13 +3100,14 @@ static int lock_folio_maybe_drop_mmap(st
 	if (vmf->flags & FAULT_FLAG_KILLABLE) {
 		if (__folio_lock_killable(folio)) {
 			/*
-			 * We didn't have the right flags to drop the mmap_lock,
-			 * but all fault_handlers only check for fatal signals
-			 * if we return VM_FAULT_RETRY, so we need to drop the
-			 * mmap_lock here and return 0 if we don't have a fpin.
+			 * We didn't have the right flags to drop the
+			 * fault lock, but all fault_handlers only check
+			 * for fatal signals if we return VM_FAULT_RETRY,
+			 * so we need to drop the fault lock here and
+			 * return 0 if we don't have a fpin.
 			 */
 			if (*fpin == NULL)
-				mmap_read_unlock(vmf->vma->vm_mm);
+				release_fault_lock(vmf);
 			return 0;
 		}
 	} else
_

Patches currently in -mm which might be from willy@infradead.org are

i915-limit-the-length-of-an-sg-list-to-the-requested-length.patch
mm-report-success-more-often-from-filemap_map_folio_range.patch
mm-abstract-moving-to-the-next-pfn.patch
mm-convert-dax-lock-unlock-page-to-lock-unlock-folio.patch
buffer-pass-gfp-flags-to-folio_alloc_buffers.patch
buffer-hoist-gfp-flags-from-grow_dev_page-to-__getblk_gfp.patch
buffer-hoist-gfp-flags-from-grow_dev_page-to-__getblk_gfp-fix.patch
ext4-use-bdev_getblk-to-avoid-memory-reclaim-in-readahead-path.patch
buffer-use-bdev_getblk-to-avoid-memory-reclaim-in-readahead-path.patch
buffer-convert-getblk_unmovable-and-__getblk-to-use-bdev_getblk.patch
buffer-convert-sb_getblk-to-call-__getblk.patch
ext4-call-bdev_getblk-from-sb_getblk_gfp.patch
buffer-remove-__getblk_gfp.patch
hugetlb-use-a-folio-in-free_hpage_workfn.patch
hugetlb-remove-a-few-calls-to-page_folio.patch
hugetlb-convert-remove_pool_huge_page-to-remove_pool_hugetlb_folio.patch
mm-make-lock_folio_maybe_drop_mmap-vma-lock-aware.patch
mm-call-wp_page_copy-under-the-vma-lock.patch
mm-handle-shared-faults-under-the-vma-lock.patch
mm-handle-cow-faults-under-the-vma-lock.patch
mm-handle-read-faults-under-the-vma-lock.patch
mm-handle-write-faults-to-ro-pages-under-the-vma-lock.patch