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Date: Wed, 7 Mar 2007 15:50:42 +0100 From: Nick Piggin <npiggin@...e.de> To: Miklos Szeredi <miklos@...redi.hu> Cc: a.p.zijlstra@...llo.nl, akpm@...ux-foundation.org, mingo@...e.hu, linux-mm@...ck.org, linux-kernel@...r.kernel.org, benh@...nel.crashing.org, jdike@...toit.com Subject: Re: [patch 4/6] mm: merge populate and nopage into fault (fixes nonlinear) On Wed, Mar 07, 2007 at 02:53:07PM +0100, Miklos Szeredi wrote: > > > msync() might never get called and then we're back with the old > > > behaviour where we can surprise the VM with a ton of dirty pages. > > > > But we're root. With your patch, root *can't* do nonlinear writeback > > well. Ever. With msync, at least you give them enough rope. > > Restricting to root doesn't buy you much, nobody wants to be root. > Restricting to mlock is similarly pointless. UML _will_ want to get > swapped out if there's no activity. They could always not use nonlinear, or we could add a ulimit to the size of nonlinear vaddr allowed. > Restricting to tmpfs makes sense, but it's probably not what UML > wants. I think it is OK. They might want some persistent storage to migrate or something, but that can always be done by copying from tmpfs to a block based filesystem. - 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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