From: "Barry Song (Xiaomi)" <baohua@kernel•org>
To: akpm@linux-foundation•org, linux-mm@kvack•org, willy@infradead•org
Cc: david@kernel•org, ljs@kernel•org, liam@infradead•org,
vbabka@kernel•org, rppt@kernel•org, surenb@google•com,
mhocko@suse•com, jack@suse•cz, pfalcato@suse•de,
wanglian@kylinos•cn, chentao@kylinos•cn, lianux.mm@gmail•com,
kunwu.chan@gmail•com, liyangouwen1@oppo•com, chrisl@kernel•org,
kasong@tencent•com, shikemeng@huaweicloud•com, nphamcs@gmail•com,
bhe@redhat•com, youngjun.park@lge•com,
linux-arm-kernel@lists•infradead.org,
linux-kernel@vger•kernel.org, loongarch@lists•linux.dev,
linuxppc-dev@lists•ozlabs.org, linux-riscv@lists•infradead.org,
linux-s390@vger•kernel.org,
"Barry Song (Xiaomi)" <baohua@kernel•org>
Subject: [PATCH v2 5/5] mm/filemap: Avoid retrying page faults on uptodate folios in filemap faults
Date: Thu, 30 Apr 2026 12:04:27 +0800 [thread overview]
Message-ID: <20260430040427.4672-6-baohua@kernel.org> (raw)
In-Reply-To: <20260430040427.4672-1-baohua@kernel.org>
For uptodate folios, we are not waiting on I/O. We should
be able to acquire the folio lock shortly, so there is no
need to drop per-vma locks and perform a full PF retry.
Signed-off-by: Barry Song (Xiaomi) <baohua@kernel•org>
---
mm/filemap.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/mm/filemap.c b/mm/filemap.c
index b532d6cbafc8..0d2f6af5d0fe 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -3533,6 +3533,13 @@ vm_fault_t filemap_fault(struct vm_fault *vmf)
}
}
+ /*
+ * If the folio is uptodate, we are likely only waiting for
+ * another concurrent PTE mapping to complete, which should
+ * be brief. No need to drop the lock and retry the fault.
+ */
+ if (folio_test_uptodate(folio))
+ vmf->flags &= ~FAULT_FLAG_ALLOW_RETRY;
if (!lock_folio_maybe_drop_mmap(vmf, folio, &fpin))
goto out_retry;
--
2.39.3 (Apple Git-146)
next prev parent reply other threads:[~2026-04-30 4:05 UTC|newest]
Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-30 4:04 [PATCH v2 0/5] mm: reduce mmap_lock contention and improve page fault performance Barry Song (Xiaomi)
2026-04-30 4:04 ` [PATCH v2 1/5] mm/filemap: Retry fault by VMA lock if the lock was released for I/O Barry Song (Xiaomi)
2026-04-30 4:04 ` [PATCH v2 2/5] mm/swapin: Retry swapin " Barry Song (Xiaomi)
2026-04-30 4:04 ` [PATCH v2 3/5] mm: Move folio_lock_or_retry() and drop __folio_lock_or_retry() Barry Song (Xiaomi)
2026-04-30 4:04 ` [PATCH v2 4/5] mm: Don't retry page fault if folio is uptodate during swap-in Barry Song (Xiaomi)
2026-04-30 12:35 ` Matthew Wilcox
2026-05-01 16:11 ` Matthew Wilcox
2026-04-30 4:04 ` Barry Song (Xiaomi) [this message]
2026-04-30 12:37 ` [PATCH v2 0/5] mm: reduce mmap_lock contention and improve page fault performance Matthew Wilcox
2026-04-30 22:49 ` Barry Song
2026-05-01 14:56 ` Matthew Wilcox
2026-05-01 17:44 ` Barry Song
2026-05-01 17:57 ` Matthew Wilcox
2026-05-01 18:25 ` Barry Song
2026-05-01 19:39 ` Matthew Wilcox
2026-05-03 20:39 ` Barry Song
2026-05-03 13:13 ` Jan Kara
2026-05-03 19:55 ` Barry Song
2026-05-04 13:03 ` Jan Kara
2026-05-04 13:35 ` Barry Song
2026-05-04 14:15 ` Barry Song
2026-05-17 8:45 ` Barry Song
2026-05-18 9:46 ` Lorenzo Stoakes
2026-05-18 11:25 ` Barry Song
2026-05-18 16:17 ` Matthew Wilcox
2026-05-18 20:50 ` Barry Song
2026-05-18 19:56 ` Suren Baghdasaryan
2026-05-18 21:14 ` Barry Song
2026-05-19 12:45 ` Lorenzo Stoakes
2026-05-19 14:17 ` Liam R. Howlett
2026-05-19 22:01 ` Barry Song
2026-05-20 21:04 ` Matthew Wilcox
2026-05-20 21:14 ` Barry Song
2026-05-20 21:15 ` Matthew Wilcox
2026-05-20 21:35 ` David Hildenbrand (Arm)
2026-05-20 23:37 ` Barry Song
2026-05-22 15:53 ` Lorenzo Stoakes
2026-05-22 21:31 ` Barry Song
2026-05-22 2:33 ` Barry Song (Xiaomi)
2026-05-22 13:09 ` Matthew Wilcox
2026-05-22 13:36 ` Barry Song
2026-05-22 13:48 ` Barry Song
2026-05-22 15:42 ` Lorenzo Stoakes
2026-05-19 12:53 ` Lorenzo Stoakes
2026-05-19 21:18 ` Barry Song
2026-05-20 7:50 ` Lorenzo Stoakes
2026-05-20 9:07 ` Barry Song
2026-05-20 10:07 ` Lorenzo Stoakes
2026-05-20 16:20 ` Suren Baghdasaryan
2026-05-20 5:51 ` Suren Baghdasaryan
2026-05-22 15:39 ` Lorenzo Stoakes
2026-05-20 10:33 ` David Hildenbrand (Arm)
2026-05-20 12:55 ` Lorenzo Stoakes
2026-05-20 21:39 ` Yang Shi
2026-05-22 15:37 ` Lorenzo Stoakes
2026-05-19 12:43 ` Lorenzo Stoakes
2026-05-18 9:53 ` David Hildenbrand (Arm)
2026-05-19 13:42 ` Lorenzo Stoakes
2026-05-18 21:21 ` Yang Shi
2026-05-19 11:07 ` Barry Song
2026-05-19 13:34 ` Lorenzo Stoakes
2026-05-19 18:50 ` Yang Shi
2026-05-19 20:53 ` Yang Shi
2026-05-19 13:12 ` Lorenzo Stoakes
2026-05-19 13:39 ` Lorenzo Stoakes
2026-05-19 18:41 ` Yang Shi
2026-05-19 21:02 ` Yang Shi
2026-05-20 8:11 ` Lorenzo Stoakes
2026-05-01 15:52 ` Lorenzo Stoakes
2026-05-01 16:06 ` Matthew Wilcox
2026-05-01 17:09 ` Lorenzo Stoakes
2026-05-01 17:59 ` Barry Song
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