Messages in this thread | | | Date | Fri, 24 Feb 2012 11:47:48 +0900 | From | KAMEZAWA Hiroyuki <> | Subject | Re: [PATCH] mm: Enable MAP_UNINITIALIZED for archs with mmu |
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On Thu, 23 Feb 2012 10:42:16 -0800 Arun Sharma <asharma@fb.com> wrote:
> Hi Balbir, > > Thanks for reviewing. Would you change your position if I limit the > scope of the patch to a cgroup with a single address space? > > The moment the cgroup sees more than one address space (either due to > tasks getting created or being added), this optimization would be turned > off. > > More details below: > > On 2/22/12 11:45 PM, Balbir Singh wrote: > > > > So the assumption is that only apps that have access to each others > > VMA's will run in this cgroup? > > > > In a distributed computing environment, a user submits a job to the > cluster job scheduler. The job might involve multiple related > executables and might involve multiple address spaces. But they're > performing one logical task, have a single resource limit enforced by a > cgroup. > > They don't have access to each other's VMAs, but if "accidentally" one > of them comes across an uninitialized page with data from another task, > it's not a violation of the security model. > How do you handle shared resouce, file-cache ?
Thanks, -Kame
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