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xfs: drop ->writepage completely 

->writepage is only used in one place - single page writeback from
memory reclaim. We only allow such writeback from kswapd, not from
direct memory reclaim, and so it is rarely used. When it comes from
kswapd, it is effectively random dirty page shoot-down, which is
horrible for IO patterns. We will already have background writeback
trying to clean all the dirty pages in memory as efficiently as
possible, so having kswapd interrupt our well formed IO stream only
slows things down. So get rid of xfs_vm_writepage() completely.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
[djwong: forward port to 5.15]
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
This commit is contained in:
Dave Chinner 2021-08-10 18:33:41 -07:00 committed by Darrick J. Wong
parent 33c0dd7898
commit 21b4ee7029
1 changed files with 0 additions and 17 deletions
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17
fs/xfs/xfs_aops.c
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@ -461,22 +461,6 @@ static const struct iomap_writeback_ops xfs_writeback_ops = {
.discard_page = xfs_discard_page,
};
STATIC int
xfs_vm_writepage(
struct page *page,
struct writeback_control *wbc)
{
struct xfs_writepage_ctx wpc = { };
if (WARN_ON_ONCE(current->journal_info)) {
redirty_page_for_writepage(wbc, page);
unlock_page(page);
return 0;
}
return iomap_writepage(page, wbc, &wpc.ctx, &xfs_writeback_ops);
}
STATIC int
xfs_vm_writepages(
struct address_space *mapping,
@ -559,7 +543,6 @@ xfs_iomap_swapfile_activate(
const struct address_space_operations xfs_address_space_operations = {
.readpage = xfs_vm_readpage,
.readahead = xfs_vm_readahead,
.writepage = xfs_vm_writepage,
.writepages = xfs_vm_writepages,
.set_page_dirty = __set_page_dirty_nobuffers,
.releasepage = iomap_releasepage,