From: Matthew Wilcox <matthew.r.wilcox@intel.com>
To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Matthew Wilcox <willy@linux.intel.com>
Subject: [PATCH v2 2/6] dax: Use copy_from_iter_nocache
Date: Fri, 3 Jul 2015 10:40:39 -0400 [thread overview]
Message-ID: <1435934443-17090-3-git-send-email-matthew.r.wilcox@intel.com> (raw)
In-Reply-To: <1435934443-17090-1-git-send-email-matthew.r.wilcox@intel.com>
From: Matthew Wilcox <willy@linux.intel.com>
When userspace does a write, there's no need for the written data to
pollute the CPU cache. This matches the original XIP code.
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
---
fs/dax.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/dax.c b/fs/dax.c
index 99b5fbc..eaa9e06 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -155,7 +155,7 @@ static ssize_t dax_io(struct inode *inode, struct iov_iter *iter,
}
if (iov_iter_rw(iter) == WRITE)
- len = copy_from_iter(addr, max - pos, iter);
+ len = copy_from_iter_nocache(addr, max - pos, iter);
else if (!hole)
len = copy_to_iter(addr, max - pos, iter);
else
--
2.1.4
next prev parent reply other threads:[~2015-07-03 14:40 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-03 14:40 [PATCH v2 0/6] Miscellaneous DAX patches, take 2 Matthew Wilcox
2015-07-03 14:40 ` [PATCH v2 1/6] dax: Add block size note to documentation Matthew Wilcox
2015-07-04 5:03 ` Christoph Hellwig
2015-07-05 8:43 ` Boaz Harrosh
2015-07-03 14:40 ` Matthew Wilcox [this message]
2015-07-05 13:11 ` [PATCH v2 2/6] dax: Use copy_from_iter_nocache Boaz Harrosh
2015-07-03 14:40 ` [PATCH v2 3/6] ext4: Use ext4_get_block_write() for DAX Matthew Wilcox
2015-07-03 18:30 ` Theodore Ts'o
2015-07-03 18:48 ` Matthew Wilcox
2015-07-03 19:07 ` Theodore Ts'o
2015-07-05 13:29 ` Boaz Harrosh
2015-07-03 14:40 ` [PATCH v2 4/6] vfs: Allow truncate, chomd and chown to be interrupted by fatal signals Matthew Wilcox
2015-07-03 14:40 ` [PATCH v2 5/6] block: Add support for DAX reads/writes to block devices Matthew Wilcox
2015-07-05 13:47 ` Boaz Harrosh
2015-07-03 14:40 ` [PATCH v2 6/6] dax: bdev_direct_access() may sleep Matthew Wilcox
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