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Message-Id: <E1OElCI-0005v6-4D@pomaz-ex.szeredi.hu> Date: Wed, 19 May 2010 17:28:38 +0200 From: Miklos Szeredi <miklos@...redi.hu> To: Linus Torvalds <torvalds@...ux-foundation.org> CC: npiggin@...e.de, rostedt@...dmis.org, mathieu.desnoyers@...icios.com, peterz@...radead.org, fweisbec@...il.com, tardyp@...il.com, mingo@...e.hu, acme@...hat.com, tzanussi@...il.com, paulus@...ba.org, linux-kernel@...r.kernel.org, arjan@...radead.org, ziga.mahkovec@...il.com, davem@...emloft.net, linux-mm@...ck.org, akpm@...ux-foundation.org, kosaki.motohiro@...fujitsu.com, cl@...ux-foundation.org, tj@...nel.org, jens.axboe@...cle.com Subject: Re: Unexpected splice "always copy" behavior observed On Wed, 19 May 2010, Linus Torvalds wrote: > The real limitation is likely always going to be the fact that it has to > be page-aligned and a full page. For a lot of splice inputs, that simply > won't be the case, and you'll end up copying for alignment reasons anyway. Another limitation I found while splicing from one file to another is that stealing from the source file's page cache does not always succeed. This turned out to be because of a reference from the lru cache for freshly read pages. I'm not sure how this could be fixed. Miklos -- 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/
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