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Re: Interface for the new fallocate() system call

To: Paul Mackerras <paulus@xxxxxxxxx>
Subject: Re: Interface for the new fallocate() system call
From: JÃrn Engel <joern@xxxxxxxxxxxxxxx>
Date: Mon, 9 Apr 2007 18:34:37 +0200
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, "Amit K. Arora" <aarora@xxxxxxxxxxxxxxxxxx>, torvalds@xxxxxxxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-ext4@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx, suparna@xxxxxxxxxx, cmm@xxxxxxxxxx
In-reply-to: <17946.14646.808334.441833@cargo.ozlabs.ibm.com>
References: <20070316143101.GA10152@amitarora.in.ibm.com> <20070316161704.GE8525@osiris.boeblingen.de.ibm.com> <20070317111036.GC29931@parisc-linux.org> <20070321120425.GA27273@amitarora.in.ibm.com> <20070329115126.GB7374@amitarora.in.ibm.com> <20070329101010.7a2b8783.akpm@linux-foundation.org> <20070330071929.GC8365@osiris.boeblingen.de.ibm.com> <17932.54606.323431.491736@cargo.ozlabs.ibm.com> <20070330104449.GA9371@lazybastard.org> <17946.14646.808334.441833@cargo.ozlabs.ibm.com>
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On Mon, 9 April 2007 23:01:42 +1000, Paul Mackerras wrote:
> JÃrn Engel writes:
> 
> > Wouldn't that work be confined to fallocate()?  If I understand Heiko
> > correctly, the alternative would slow s390 down for every syscall,
> > including more performance-critical ones.
> 
> The alternative that Jakub suggested wouldn't slow s390 down.

True.  And it appears to be one of the least offensive options we have.

JÃrn

-- 
My second remark is that our intellectual powers are rather geared to
master static relations and that our powers to visualize processes
evolving in time are relatively poorly developed.
-- Edsger W. Dijkstra


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