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Message-ID: <51241C32.3050500@gmail.com> Date: Wed, 20 Feb 2013 08:43:30 +0800 From: Will Huck <will.huckk@...il.com> To: Hugh Dickins <hughd@...gle.com> CC: Li Haifeng <omycle@...il.com>, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org Subject: Re: Should a swapped out page be deleted from swap cache? On 02/20/2013 03:06 AM, Hugh Dickins wrote: > On Tue, 19 Feb 2013, Will Huck wrote: >> Another question: > I don't see the connection to deleting a swapped out page from swap cache. > >> Why kernel memory mapping use direct mapping instead of kmalloc/vmalloc which >> will setup mapping on demand? > I may misunderstand you, and "kernel memory mapping". > > kmalloc does not set up a mapping, it uses the direct mapping already set up. > > It would be circular if the basic page allocation primitives used kmalloc, > since kmalloc relies on the basic page allocation primitives. > > vmalloc is less efficient than using the direct mapping (repeated setup > and teardown, no use of hugepages), but necessary when you want a larger Is there tlb flush in setup and teardown process? and they also expensive? > virtual array than you're likely to find from the buddy allocator. > > Hugh -- 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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