> From: Jamie Lokier [mailto:jamie@xxxxxxxxxxxxx] > 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@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
