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Message-ID: <50C9E692.9070506@gmail.com> Date: Thu, 13 Dec 2012 07:30:42 -0700 From: David Ahern <dsahern@...il.com> To: Ingo Molnar <mingo@...nel.org>, Linus Torvalds <torvalds@...ux-foundation.org> CC: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Arnaldo Carvalho de Melo <acme@...radead.org>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Thomas Gleixner <tglx@...utronix.de>, Andrew Morton <akpm@...ux-foundation.org> Subject: Re: [GIT PULL] perf changes for v3.8 On 12/13/12 12:30 AM, Ingo Molnar wrote: > > * David Ahern <dsahern@...il.com> wrote: > >>> But doing it this way was wrong. Switch that "exclude_guest" >>> attribute around, and admit that "H" was bogus, and that the >>> right thing to do was to add a "V" flag that sets the >>> "force_guest" flag instead. >> >> I understand this is annoying. [...] > > It's not annoying, it's outright broken - it's a regression that > we'll fix. One of the problems is that existing binaries set the exclude_guest flag (https://lkml.org/lkml/2012/7/9/292). So, requesting users to update their binaries if they want to use precise sampling is not acceptable. A 100% catastrophic failure of all running VMs is acceptable? All VMs will crash and there is no direct causal relationship. David -- 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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