On Fri, Oct 24, 2014 at 09:54:23AM +0200, Ingo Molnar wrote: > > * Peter Zijlstra <pet...@infradead.org> wrote: > > > On Thu, Oct 23, 2014 at 06:40:05PM +0800, Lai Jiangshan wrote: > > > On 10/22/2014 01:56 AM, Peter Zijlstra wrote: > > > > On Tue, Oct 21, 2014 at 08:09:48PM +0300, Kirill A. Shutemov wrote: > > > >> It would be interesting to see if the patchset affects non-condended > > > >> case. > > > >> Like a one-threaded workload. > > > > > > > > It does, and not in a good way, I'll have to look at that... :/ > > > > > > Maybe it is blamed to find_vma_srcu() that it doesn't take the advantage > > > of > > > the vmacache_find() and cause more cache-misses. > > > > Its what I thought initially, I tried doing perf record with and > > without, but then I ran into perf diff not quite working for me and I've > > yet to find time to kick that thing into shape. > > Might be the 'perf diff' regression fixed by this: > > 9ab1f50876db perf diff: Add missing hists__init() call at tool start > > I just pushed it out into tip:master.
I was on tip/master, so unlikely to be that as I was likely already having it. perf-report was affected too, for some reason my CONFIG_DEBUG_INFO=y vmlinux wasn't showing symbols (and I double checked that KASLR crap was disabled, so that wasn't confusing stuff either). When I forced perf-report to use kallsyms it works, however perf-diff doesn't have that option. So there's two issues there, 1) perf-report failing to generate useful output and 2) per-diff lacking options to force it to behave. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
