[dm-devel] [patch 0/8] dm-bufio patches
Mikulas Patocka
mpatocka at redhat.com
Mon Mar 26 20:20:41 UTC 2018
On Mon, 26 Mar 2018, Mike Snitzer wrote:
> On Mon, Mar 26 2018 at 2:29pm -0400,
> mpatocka at redhat.com <mpatocka at redhat.com> wrote:
>
> > Hi
> >
> > Here I'm sending the second version of dm-bufio patches for arbitrary
> > sector size.
> >
> > I dropped the patch that removes alloc_pages because it turns out that
> > alloc_pages is faster than the slab allocator.
>
> I had already staged the previous set, so I need to go back over that
> and update accordingly.
>
> > I also added a patch that removes struct bio from struct dm_buffer
> > (reducing the size of dm_buffer to 1/3) and allocates the bio only when
> > doing read or write.
>
> OK, I'll go over your new set and try to tease out any differences.
>
> Mike
One more patch that I forgot to include.
From: Mikulas Patocka <mpatocka at redhat.com>
Subject: [PATCH] dm-bufio: delete outdated comment
This comment was true when dm-bufio was written, but since the kernel 4.3,
bios can have arbitrary size and the driver splits them.
Signed-off-by: Mikulas Patocka <mpatocka at redhat.com>
---
drivers/md/dm-bufio.c | 4 ----
1 file changed, 4 deletions(-)
Index: linux-2.6/drivers/md/dm-bufio.c
===================================================================
--- linux-2.6.orig/drivers/md/dm-bufio.c 2018-03-13 16:38:32.257954000 +0100
+++ linux-2.6/drivers/md/dm-bufio.c 2018-03-13 16:38:32.247954000 +0100
@@ -540,10 +540,6 @@ static void __relink_lru(struct dm_buffe
*
* the memory must be direct-mapped, not vmalloced;
*
- * the I/O driver can reject requests spuriously if it thinks that
- * the requests are too big for the device or if they cross a
- * controller-defined memory boundary.
- *
* If the buffer is small enough (up to DM_BUFIO_INLINE_VECS pages) and
* it is not vmalloced, try using the bio interface.
*
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