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Message-ID: <546C18C5.5090508@oracle.com> Date: Tue, 18 Nov 2014 23:12:53 -0500 From: Sasha Levin <sasha.levin@...cle.com> To: Andrew Morton <akpm@...ux-foundation.org> CC: Hugh Dickins <hughd@...gle.com>, "linux-mm@...ck.org" <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>, Dave Jones <davej@...hat.com>, Jens Axboe <axboe@...nel.dk> Subject: Re: mm: shmem: freeing mlocked page On 11/18/2014 10:56 PM, Andrew Morton wrote: >> Trinity can't really log anything because attempts to log syscalls slow everything >> > down to a crawl to the point nothing reproduces. > Ah. I was thinking that it could be worked out by looking at the > trinity source around where it calls splice(). But I suspect that > doesn't make sense if trinity just creates a zillion threads each of > which sprays semi-random syscalls at the kernel(?). I think Dave would agree here that this is a rather accurate description of Trinity :) >> > I've just looked at that trace above, and got a bit more confused. I didn't think >> > that you can mlock page cache. How would a user do that exactly? > mmap it then mlock it! The kernel will fault everything in for you > then pin it down. But that's a pipe buffer, I didn't think userspace can mmap pipes? I have some reading to do. Thanks, Sasha -- 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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