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Message-ID: <20071005070117.GB30528@linux.vnet.ibm.com> Date: Fri, 5 Oct 2007 12:31:17 +0530 From: Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com> To: Valdis.Kletnieks@...edu Cc: Heiko Carstens <heiko.carstens@...ibm.com>, Ingo Molnar <mingo@...e.hu>, Dhaval Giani <dhaval@...ux.vnet.ibm.com>, Mike Galbraith <efault@....de>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Dmitry Adamushko <dmitry.adamushko@...il.com>, lkml <linux-kernel@...r.kernel.org>, maneesh@...ux.vnet.ibm.com, Andrew Morton <akpm@...ux-foundation.org>, Sudhir Kumar <skumar@...ux.vnet.ibm.com> Subject: Re: [RFC/PATCH -v2] Add sysfs control to modify a user's cpu share On Thu, Oct 04, 2007 at 05:32:17PM -0400, Valdis.Kletnieks@...edu wrote: > > Shouldn't that be done via uevents? E.g. UID x gets added to the sysfs tree, > > generates a uevent and a script then figures out the cpu_share and sets it. > > That would tend to be a tad racy - a site may want to set limits in the > hypothetical /sys/kernel/uids/NNN before the program has a chance to fork-bomb > or otherwise make it difficult to set a limitfrom within another userspace Note that there is a default limit enforced on every new user (1024 value for the user's cpu share). This limit should contain any fork-bomb that the user may launch immediately. > process. It's similar to why you want a process to be launched with all its > ulimit's set, rather than set them after the fork/exec happens... -- Regards, vatsa - 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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