From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matt Fleming Date: Wed, 24 Aug 2011 19:51:31 +0000 Subject: Re: How performance critical is fsys_rt_sigprocmask()? Message-Id: <1314215491.3611.49.camel@mfleming-mobl1.ger.corp.intel.com> List-Id: References: <1314196796.3611.38.camel@mfleming-mobl1.ger.corp.intel.com> In-Reply-To: <1314196796.3611.38.camel@mfleming-mobl1.ger.corp.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org On Wed, 2011-08-24 at 09:13 -0600, David Mosberger-Tang wrote: > Matt, > > As I remember it, it was the single system-call on the critical path of > libunwind. Don't remember the numbers, but it was significant. Interesting. So that'd be the critical path for things like performance analysis tools that record stack traces? Yeah, I can see how you'd want the stack trace recording to have very little overhead. I guess I'll start writing ia64 assembly then... -- Matt Fleming, Intel Open Source Technology Center