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From: | Avi Kivity |
Subject: | Re: [Qemu-devel] [RFC PATCH 1/1] ceph/rbd block driver for qemu-kvm |
Date: | Tue, 25 May 2010 19:27:23 +0300 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.9) Gecko/20100330 Fedora/3.0.4-1.fc12 Thunderbird/3.0.4 |
On 05/25/2010 07:21 PM, Anthony Liguori wrote:
On 05/25/2010 11:16 AM, Avi Kivity wrote:On 05/25/2010 06:01 PM, Anthony Liguori wrote:On 05/25/2010 10:00 AM, Avi Kivity wrote:The latter. Why is it less important? If you don't inherit the memory, you can't access it.You can also pass /dev/shm fd's via SCM_RIGHTs to establish shared memory segments dynamically.Doesn't work for anonymous memory.What's wrong with /dev/shm memory?The kernel treats anonymous and nonymous memory differently for swapping (see /proc/sys/vm/swappiness); transparent hugepages won't work for /dev/shm (though it may be argued that that's a problem with thp); setup (/dev/shm defaults to half memory IIRC, we want mem+swap); different cgroup handling; somewhat clunky (a minor concern to be sure).Surely, with mmu notifiers, it wouldn't be that hard to share anonymous memory via an fd though, no?
That's what I suggested with processfd(). I wouldn't call it easy but it's likely doable. Whether it's mergable is a different issue.
-- error compiling committee.c: too many arguments to function
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