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| author | Filipe Manana <fdmanana@suse.com> | 2024-12-09 16:43:44 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-01-02 10:32:10 +0100 |
| commit | 6e1a8225930719a9f352d56320214e33e2dde0a6 (patch) | |
| tree | 91ba8387b79626b2d0fa2422e4698a738125c014 | |
| parent | 13eb3cae1d8e23cce96c095abe34da8028c09ac5 (diff) | |
| download | linux-6e1a8225930719a9f352d56320214e33e2dde0a6.tar.gz linux-6e1a8225930719a9f352d56320214e33e2dde0a6.tar.bz2 linux-6e1a8225930719a9f352d56320214e33e2dde0a6.zip | |
btrfs: avoid monopolizing a core when activating a swap file
commit 2c8507c63f5498d4ee4af404a8e44ceae4345056 upstream.
During swap activation we iterate over the extents of a file and we can
have many thousands of them, so we can end up in a busy loop monopolizing
a core. Avoid this by doing a voluntary reschedule after processing each
extent.
CC: stable@vger.kernel.org # 5.4+
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/btrfs/inode.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 035815c43949..d6767f728c07 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -7153,6 +7153,8 @@ noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len, ret = -EAGAIN; goto out; } + + cond_resched(); } if (orig_start) |