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Date: Fri, 27 Nov 2015 09:52:16 +0800 From: Xishi Qiu <qiuxishi@...wei.com> To: Mark Rutland <mark.rutland@....com> CC: zhong jiang <zhongjiang@...wei.com>, <catalin.marinas@....com>, <will.deacon@....com>, <lauraa@...eaurora.org>, <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>, <guohanjun@...wei.com> Subject: Re: [PATCH] arm64: calculate the various pages number to show On 2015/11/26 23:49, Mark Rutland wrote: > On Thu, Nov 26, 2015 at 11:05:32PM +0800, zhong jiang wrote: >> On 2015/11/25 23:04, Mark Rutland wrote: >>> On Wed, Nov 25, 2015 at 09:41:12PM +0800, zhongjiang wrote: >>>> This patch add the interface to show the number of 4KB or 64KB page, >>>> aims to statistics the number of different types of pages. >>> >>> What is this useful for? Why do we want it? >>> >>> What does it account for, just the swapper? >>> >> >> The patch is wirtten when I was in backport set_memory_ro. It can be used to >> detect whether there is a large page spliting and merging. large page will >> significantly reduce the TLB miss, and improve the system performance. > > Ok, but typically the user isn't going to be able to do much with this > information. It feels more like something that should be in the page > table dump code (where we can calculate the values as we walk the > tables). > > What is it intended to account for? > > The entire swapper? > > Just the linear mapping? Hi Mark, x86 has this information when cat /proc/meminfo, so how about just like x86 to show it? Thanks, Xishi Qiu -- 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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