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Date: Wed, 14 Aug 2013 17:23:09 -0400 From: Chris Metcalf <cmetcalf@...era.com> To: Andrew Morton <akpm@...ux-foundation.org> CC: Tejun Heo <tj@...nel.org>, <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>, Thomas Gleixner <tglx@...utronix.de>, Frederic Weisbecker <fweisbec@...il.com>, Cody P Schafer <cody@...ux.vnet.ibm.com> Subject: Re: [PATCH v8] mm: make lru_add_drain_all() selective On 8/14/2013 5:12 PM, Andrew Morton wrote: > On Wed, 14 Aug 2013 16:22:18 -0400 Chris Metcalf <cmetcalf@...era.com> wrote: > >> This change makes lru_add_drain_all() only selectively interrupt >> the cpus that have per-cpu free pages that can be drained. >> >> This is important in nohz mode where calling mlockall(), for >> example, otherwise will interrupt every core unnecessarily. > Changelog isn't very informative. I added this: > > : This is important on workloads where nohz cores are handling 10 Gb traffic > : in userspace. Those CPUs do not enter the kernel and place pages into LRU > : pagevecs and they really, really don't want to be interrupted, or they > : drop packets on the floor. > > to attempt to describe the rationale for the patch. Thanks. More motivational text is always a good thing. -- Chris Metcalf, Tilera Corp. http://www.tilera.com -- 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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