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authorAndrew Morton <akpm@osdl.org>2006-09-25 23:32:42 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-09-26 08:48:58 -0700
commitab954160350c91c77ae03740ef90458c3ad5412c (patch)
tree28f99d765c2c6d497a1f5543b1867875cd6102a5 /mm
parent3a4f7577c9ef393ca80c783f02ffbc125de771c7 (diff)
[PATCH] swsusp: write speedup
Switch the swsusp writeout code from 4k-at-a-time to 4MB-at-a-time. Crufty old PIII testbox: 12.9 MB/s -> 20.9 MB/s Sony Vaio: 14.7 MB/s -> 26.5 MB/s The implementation is crude. A better one would use larger BIOs, but wouldn't gain any performance. The memcpys will be mostly pipelined with the IO and basically come for free. The ENOMEM path has not been tested. It should be. Cc: Pavel Machek <pavel@ucw.cz> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/page_io.c25
1 files changed, 19 insertions, 6 deletions
diff --git a/mm/page_io.c b/mm/page_io.c
index d2f0a578337..f46a9862b7e 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -156,10 +156,12 @@ out:
* We use end_swap_bio_read() even for writes, because it happens to do what
* we want.
*/
-int rw_swap_page_sync(int rw, swp_entry_t entry, struct page *page)
+int rw_swap_page_sync(int rw, swp_entry_t entry, struct page *page,
+ struct bio **bio_chain)
{
struct bio *bio;
int ret = 0;
+ int bio_rw;
lock_page(page);
@@ -170,11 +172,22 @@ int rw_swap_page_sync(int rw, swp_entry_t entry, struct page *page)
goto out;
}
- submit_bio(rw | (1 << BIO_RW_SYNC), bio);
- wait_on_page_locked(page);
-
- if (!PageUptodate(page) || PageError(page))
- ret = -EIO;
+ bio_rw = rw;
+ if (!bio_chain)
+ bio_rw |= (1 << BIO_RW_SYNC);
+ if (bio_chain)
+ bio_get(bio);
+ submit_bio(bio_rw, bio);
+ if (bio_chain == NULL) {
+ wait_on_page_locked(page);
+
+ if (!PageUptodate(page) || PageError(page))
+ ret = -EIO;
+ }
+ if (bio_chain) {
+ bio->bi_private = *bio_chain;
+ *bio_chain = bio;
+ }
out:
return ret;
}