linux-kernel - Re: [PATCH v11 00/21] Add support for NV-DIMMs to ext4

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Message-ID: <x49r3yrn68k.fsf@segfault.boston.devel.redhat.com>
Date:	Wed, 01 Oct 2014 11:45:47 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Valdis.Kletnieks@...edu
Cc:	Andreas Dilger <adilger@...ger.ca>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v11 00/21] Add support for NV-DIMMs to ext4

Valdis.Kletnieks@...edu writes:

> As long as we're at it, if we go that route we probably *also* want a
> way for a program to specify it at open() time (for instance, for the
> use of backup programs) - that should minimize the infamous "everything
> runs like a pig after the backup finishes running because  the *useful*
> pages are all cache-cold".

This sounds an awful lot like posix_fadvise' POSIX_FADV_NOREUSE flag.
Whether the implementation lives up to your expectations is another
matter, but at least the interface is already there.

Cheers,
Jeff
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