Re: [PATCH resend] ramdisk: fix zeroed ramdisk pages on memory pressure

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To: Nick Piggin <nickpiggin@...>
Cc: Andrew Morton <akpm@...>, Christian Borntraeger <borntraeger@...>, <linux-mm@...>, <linux-kernel@...>, Martin Schwidefsky <schwidefsky@...>, Theodore Ts'o <tytso@...>
Date: Monday, October 15, 2007 - 11:14 pm

Nick Piggin <nickpiggin@yahoo.com.au> writes:


make_page_uptodate() is most hideous part I have run into.
It has to know details about other layers to now what not
to stomp.  I think my incorrect simplification of this is what messed
things up, last round.


Cool. Triple buffering :)  Although I guess that would only
apply to metadata these days.   Having a separate store would
solve some of the problems, and probably remove the need
for carefully specifying the ramdisk block size.  We would
still need the magic restictions on page allocations though
and it we would use them more often as the initial write to the
ramdisk would not populate the pages we need.

A very ugly bit seems to be the fact that we assume we can
dereference bh->b_data without any special magic which
means the ramdisk must live in low memory on 32bit machines.

Eric
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Messages in current thread:
[PATCH resend] ramdisk: fix zeroed ramdisk pages on memory p..., Christian Borntraeger, (Mon Oct 15, 4:28 am)
Re: [PATCH resend] ramdisk: fix zeroed ramdisk pages on memo..., Eric W. Biederman, (Mon Oct 15, 11:14 pm)
Re: [PATCH resend] ramdisk: fix zeroed ramdisk pages on memo..., Eric W. Biederman, (Tue Oct 16, 12:57 am)
[patch][rfc] rewrite ramdisk, Nick Piggin, (Tue Oct 16, 3:47 am)
Re: [patch][rfc] rewrite ramdisk, Eric W. Biederman, (Wed Oct 17, 6:30 am)
Re: [patch][rfc] rewrite ramdisk, Nick Piggin, (Wed Oct 17, 8:49 am)
Re: [patch][rfc] rewrite ramdisk, Eric W. Biederman, (Wed Oct 17, 2:45 pm)
Re: [patch][rfc] rewrite ramdisk, Nick Piggin, (Wed Oct 17, 9:06 pm)
Re: [patch][rfc] rewrite ramdisk, Theodore Tso, (Tue Oct 16, 5:28 pm)
Re: [patch][rfc] rewrite ramdisk, Nick Piggin, (Tue Oct 16, 6:08 pm)
Re: [patch][rfc] rewrite ramdisk, Eric W. Biederman, (Tue Oct 16, 7:48 pm)
Re: [patch][rfc] rewrite ramdisk, Nick Piggin, (Tue Oct 16, 8:28 pm)
Re: [patch][rfc] rewrite ramdisk, Eric W. Biederman, (Tue Oct 16, 9:13 pm)
Re: [patch][rfc] rewrite ramdisk, Nick Piggin, (Tue Oct 16, 9:47 pm)
Re: [patch][rfc] rewrite ramdisk, Eric W. Biederman, (Tue Oct 16, 5:08 am)
Re: [patch][rfc] rewrite ramdisk, Jan Engelhardt, (Tue Oct 16, 3:52 am)
Re: [patch][rfc] rewrite ramdisk, Nick Piggin, (Tue Oct 16, 4:07 am)
Re: [patch][rfc] rewrite ramdisk, Jan Engelhardt, (Tue Oct 16, 4:17 am)
Re: [patch][rfc] rewrite ramdisk, Nick Piggin, (Tue Oct 16, 4:26 am)
Re: [patch][rfc] rewrite ramdisk, Jan Engelhardt, (Tue Oct 16, 4:53 am)
Re: [PATCH resend] ramdisk: fix zeroed ramdisk pages on memo..., Christian Borntraeger, (Mon Oct 15, 5:05 am)
Re: [PATCH resend] ramdisk: fix zeroed ramdisk pages on memo..., Eric W. Biederman, (Mon Oct 15, 2:38 pm)
Re: [PATCH resend] ramdisk: fix zeroed ramdisk pages on memo..., Eric W. Biederman, (Mon Oct 15, 6:37 pm)
[PATCH] rd: Preserve the dirty bit in init_page_buffers(), Eric W. Biederman, (Mon Oct 15, 6:40 pm)
Re: [PATCH] rd: Preserve the dirty bit in init_page_buffers(), Eric W. Biederman, (Tue Oct 16, 5:35 am)
[PATCH] rd: Mark ramdisk buffers heads dirty, Eric W. Biederman, (Mon Oct 15, 6:42 pm)
Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Nick Piggin, (Tue Oct 16, 4:19 am)
Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Eric W. Biederman, (Tue Oct 16, 3:06 pm)
Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Nick Piggin, (Tue Oct 16, 6:06 pm)
Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Christian Borntraeger, (Tue Oct 16, 4:48 am)
Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Christian Borntraeger, (Tue Oct 16, 3:56 am)
Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Christian Borntraeger, (Wed Oct 17, 12:14 pm)
Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Eric W. Biederman, (Wed Oct 17, 1:57 pm)
Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Christian Borntraeger, (Wed Oct 17, 5:48 pm)
Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Eric W. Biederman, (Wed Oct 17, 6:22 pm)
Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Christian Borntraeger, (Thu Oct 18, 5:26 am)
Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Eric W. Biederman, (Fri Oct 19, 6:46 pm)
[PATCH] rd: Use a private inode for backing storage, Eric W. Biederman, (Fri Oct 19, 6:51 pm)
Re: [PATCH] rd: Use a private inode for backing storage, Nick Piggin, (Sun Oct 21, 12:28 am)
Re: [PATCH] rd: Use a private inode for backing storage, Eric W. Biederman, (Sun Oct 21, 1:10 am)
Re: [PATCH] rd: Use a private inode for backing storage, Eric W. Biederman, (Sun Oct 21, 2:48 am)
Re: [PATCH] rd: Use a private inode for backing storage, Eric W. Biederman, (Sun Oct 21, 1:56 pm)
Re: [PATCH] rd: Use a private inode for backing storage, Christian Borntraeger, (Sun Oct 21, 3:28 am)
Re: [PATCH] rd: Use a private inode for backing storage, Eric W. Biederman, (Sun Oct 21, 4:23 am)
Re: [PATCH] rd: Use a private inode for backing storage, Eric W. Biederman, (Sun Oct 21, 2:39 pm)
Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Chris Mason, (Wed Oct 17, 3:14 pm)
Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Eric W. Biederman, (Wed Oct 17, 4:29 pm)
Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Chris Mason, (Wed Oct 17, 4:54 pm)
Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Eric W. Biederman, (Wed Oct 17, 5:30 pm)
Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Chris Mason, (Wed Oct 17, 6:58 pm)
Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Eric W. Biederman, (Wed Oct 17, 7:28 pm)
Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Chris Mason, (Wed Oct 17, 8:03 pm)
[RFC][PATCH] block: Isolate the buffer cache in it's own map..., Eric W. Biederman, (Wed Oct 17, 11:59 pm)
Re: [RFC][PATCH] block: Isolate the buffer cache in it's own..., Eric W. Biederman, (Fri Oct 19, 5:35 pm)
Re: [RFC][PATCH] block: Isolate the buffer cache in it's own..., Eric W. Biederman, (Fri Oct 19, 5:27 pm)
Re: [RFC][PATCH] block: Isolate the buffer cache in it's own..., Eric W. Biederman, (Sun Oct 21, 12:53 am)
Re: [RFC][PATCH] block: Isolate the buffer cache in it's own..., Eric W. Biederman, (Sun Oct 21, 3:09 am)
Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Eric W. Biederman, (Wed Oct 17, 11:27 pm)
Re: [PATCH] rd: Mark ramdisk buffers heads dirty, Eric W. Biederman, (Tue Oct 16, 5:22 am)