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authorNeilBrown <neilb@suse.de>2022-05-09 18:20:49 -0700
committerakpm <akpm@linux-foundation.org>2022-05-09 18:20:49 -0700
commit5169b844b7dd5934cd4f22ab66de0cc669abf0b0 (patch)
tree97adf12221bb1191c14dafc9aae6713586060a55 /mm/memory.c
parentcba738f6490953e154d163b2980ad6d7f06307aa (diff)
mm: submit multipage reads for SWP_FS_OPS swap-space
swap_readpage() is given one page at a time, but may be called repeatedly in succession. For block-device swap-space, the blk_plug functionality allows the multiple pages to be combined together at lower layers. That cannot be used for SWP_FS_OPS as blk_plug may not exist - it is only active when CONFIG_BLOCK=y. Consequently all swap reads over NFS are single page reads. With this patch we pass in a pointer-to-pointer when swap_readpage can store state between calls - much like the effect of blk_plug. After calling swap_readpage() some number of times, the state will be passed to swap_read_unplug() which can submit the combined request. Link: https://lkml.kernel.org/r/164859778127.29473.14059420492644907783.stgit@noble.brown Signed-off-by: NeilBrown <neilb@suse.de> Reviewed-by: Christoph Hellwig <hch@lst.de> Tested-by: David Howells <dhowells@redhat.com> Tested-by: Geert Uytterhoeven <geert+renesas@glider.be> Cc: Hugh Dickins <hughd@google.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Trond Myklebust <trond.myklebust@hammerspace.com> Cc: Miaohe Lin <linmiaohe@huawei.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/memory.c')
-rw-r--r--mm/memory.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 6e9428ae6d66..90212057a546 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3633,7 +3633,7 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
/* To provide entry to swap_readpage() */
set_page_private(page, entry.val);
- swap_readpage(page, true);
+ swap_readpage(page, true, NULL);
set_page_private(page, 0);
}
} else {