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Date: Tue, 29 May 2012 21:04:03 +0800 From: Liu Zhiyou <liuzhiyou.cs@...il.com> To: Xin Tong <xerox.time.tech@...il.com> CC: Andi Kleen <andi@...stfloor.org>, linux-kernel <linux-kernel@...r.kernel.org> Subject: Re: native_save_fl taking good amount of time in profile 于 2012年05月26日 07:10, Xin Tong 写道: > i do not know its callers from the profile. one thing i am suspicious > of is that my kernel debug-info is wrong. by the way, what does the > function do ? > > Thanks > > Xin > > > On Fri, May 25, 2012 at 6:27 PM, Andi Kleen<andi@...stfloor.org> wrote: >> Xin Tong<xerox.time.tech@...il.com> writes: >> >>> I have collected a profile on the whole system. But the only thing >>> that is really running is a mysql database server. I have noticed that >>> there is a function in kernel that took 5% of the overall running >>> time. what does native_save_fl do ? does it make sense that >>> native_save_fl takes the most amount of time among all kernel >>> functions ? >> What are the callers (-g)? It does not make sense normally. >> -Andi Xin Tong, Use perf record -g, then it will give you a call-graph. $ man perf-record -g, --call-graph Do call-graph (stack chain/backtrace) recording. $ man pref-report -g [type,min[,limit],order], --call-graph Display call chains using type, min percent threshold, optional print limit and order. type can be either: · flat: single column, linear exposure of call chains. · graph: use a graph tree, displaying absolute overhead rates. · fractal: like graph, but displays relative rates. Each branch of the tree is considered as a new profiled object. order can be either: - callee: callee based call graph. - caller: inverted caller based call graph. Default: fractal,0.5,callee. Regards, LIU Zhiyou -- 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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