lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Tue, 24 Jun 2008 10:05:57 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, torvalds@...ux-foundation.org
Subject: Re: [rfc patch 4/4] splice: use do_generic_file_read()

On Sat, Jun 21 2008, Miklos Szeredi wrote:
> From: Miklos Szeredi <mszeredi@...e.cz>
> 
> __generic_file_splice_read() duplicates a lot of stuff common with the
> generic page cache reading.  So reuse that code instead to simplify
> the page cache splice code.
> 
> This also fixes some corner cases which weren't properly handled in
> the splice code because of complexity issues.  In particular it fixes
> a problem when the filesystem (e.g. fuse) invalidates pages during the
> splice operation.
> 
> There might be some slight fall in performance due to the removal of
> the gang lookup for pages.  However I'm not sure if this is
> significant enough to warrant the extra complication.

This makes everything sync, it's a no go. Why don't we look into fixing
the invalidate problem that fuse sees (can you elaborate on that?)?

I tried to do a quick performance test with your patches for comparison
in the cached case, but it crashes immediately in spd_release_page()


-- 
Jens Axboe

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists