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Date: Wed, 2 Jun 2010 08:35:43 -0700 (PDT) From: Dan Magenheimer <dan.magenheimer@...cle.com> To: Jamie Lokier <jamie@...reable.org> Cc: chris.mason@...cle.com, viro@...iv.linux.org.uk, akpm@...ux-foundation.org, adilger@....com, tytso@....edu, mfasheh@...e.com, joel.becker@...cle.com, matthew@....cx, linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org, ocfs2-devel@....oracle.com, linux-mm@...ck.org, ngupta@...are.org, jeremy@...p.org, JBeulich@...ell.com, kurt.hackel@...cle.com, npiggin@...e.de, dave.mccracken@...cle.com, riel@...hat.com, avi@...hat.com, konrad.wilk@...cle.com Subject: RE: [PATCH V2 0/7] Cleancache (was Transcendent Memory): overview > From: Jamie Lokier [mailto:jamie@...reable.org] > Subject: Re: [PATCH V2 0/7] Cleancache (was Transcendent Memory): > overview > > Dan Magenheimer wrote: > > Most important, cleancache is "ephemeral". Pages which are copied > into > > cleancache have an indefinite lifetime which is completely unknowable > > by the kernel and so may or may not still be in cleancache at any > later time. > > Thus, as its name implies, cleancache is not suitable for dirty > pages. The > > pseudo-RAM has complete discretion over what pages to preserve and > what > > pages to discard and when. > > Fwiw, the feature sounds useful to userspace too, for those things > with memory hungry caches like web browsers. Any plans to make it > available to userspace? No plans yet, though we agree it sounds useful, at least for apps that bypass the page cache (e.g. O_DIRECT). If you have time and interest to investigate this further, I'd be happy to help. Send email offlist. Thanks, Dan -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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