From: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
To: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org
Cc: Tejun Heo <tj@kernel.org>, Jens Axboe <axboe@kernel.dk>,
Johannes Weiner <hannes@cmpxchg.org>
Subject: [PATCH 2/2] mm/filemap: rewrite mapping_needs_writeback in less fancy manner
Date: Mon, 22 Jul 2019 12:36:10 +0300 [thread overview]
Message-ID: <156378817069.1087.1302816672037672488.stgit@buzz> (raw)
In-Reply-To: <156378816804.1087.8607636317907921438.stgit@buzz>
This actually checks that writeback is needed or in progress.
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
---
mm/filemap.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/mm/filemap.c b/mm/filemap.c
index d9572593e5c7..29f503ffd70b 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -618,10 +618,13 @@ int filemap_fdatawait_keep_errors(struct address_space *mapping)
}
EXPORT_SYMBOL(filemap_fdatawait_keep_errors);
+/* Returns true if writeback might be needed or already in progress. */
static bool mapping_needs_writeback(struct address_space *mapping)
{
- return (!dax_mapping(mapping) && mapping->nrpages) ||
- (dax_mapping(mapping) && mapping->nrexceptional);
+ if (dax_mapping(mapping))
+ return mapping->nrexceptional;
+
+ return mapping->nrpages;
}
int filemap_write_and_wait(struct address_space *mapping)
next prev parent reply other threads:[~2019-07-22 9:36 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-22 9:36 [PATCH 1/2] mm/filemap: don't initiate writeback if mapping has no dirty pages Konstantin Khlebnikov
2019-07-22 9:36 ` Konstantin Khlebnikov [this message]
2019-07-23 0:52 ` Andrew Morton
2019-07-23 8:16 ` Konstantin Khlebnikov
2019-07-30 14:14 ` Jan Kara
2019-07-30 14:57 ` Konstantin Khlebnikov
2019-07-30 15:48 ` Jan Kara
2019-07-30 18:15 ` Konstantin Khlebnikov
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