From: Mike Galbraith <bitbucket@online.de> To: Peter Zijlstra <peterz@infradead.org> Cc: Len Brown <lenb@kernel.org>, Ingo Molnar <mingo@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>, Stephen Rothwell <sfr@canb.auug.org.au>, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>, linux-next@vger.kernel.org, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org> Subject: Re: linux-next: build failure after merge of the tip tree Date: Tue, 21 Jan 2014 04:26:40 +0100 [thread overview] Message-ID: <1390274800.5429.14.camel@marge.simpson.net> (raw) In-Reply-To: <20140120215151.GN31570@twins.programming.kicks-ass.net> On Mon, 2014-01-20 at 22:51 +0100, Peter Zijlstra wrote: > I'm still waiting for someone to explain what's wrong with: > > static inline void mwait_idle(void) > { > local_irq_enable(); > mwait_idle_with_hints(0, 0); > } How about just do that going forward, it work, and can always be fixed if something turns up, and the below for stable once it hits mainline? Q6600 box is happy camper in all trees. From: Len Brown <len.brown@intel.com> x86 idle: restore mwait_idle() In Linux-3.9 we removed the mwait_idle() loop: 'x86 idle: remove mwait_idle() and "idle=mwait" cmdline param' (69fb3676df3329a7142803bb3502fa59dc0db2e3) The reasoning was that modern machines should be sufficiently happy during the boot process using the default_idle() HALT loop, until cpuidle loads and either acpi_idle or intel_idle invoke the newer MWAIT-with-hints idle loop. But two machines reported problems: 1. Certain Core2-era machines support MWAIT-C1 and HALT only. MWAIT-C1 is preferred for optimal power and performance. But if they support just C1, cpuidle never loads and so they use the boot-time default idle loop forever. 2. Some laptops will boot-hang if HALT is used, but will boot successfully if MWAIT is used. This appears to be a hidden assumption in BIOS SMI, that is presumably valid on the proprietary OS where the BIOS was validated. https://bugzilla.kernel.org/show_bug.cgi?id=60770 So here we effectively revert the patch above, restoring the mwait_idle() loop. However, we don't bother restoring the idle=mwait cmdline parameter, since it appears to add no value. Maintainer notes: For 3.9, simply revert 69fb3676df for 3.10, patch -F3 applies, fuzz needed due to __cpuinit use in context For 3.11, 3.12, 3.13, this patch applies cleanly Mike: reinstate polling, and add clflush barriers. Cc: Mike Galbraith <bitbucket@online.de> Cc: Ian Malone <ibmalone@gmail.com> Cc: Josh Boyer <jwboyer@redhat.com> Cc: <stable@vger.kernel.org> # 3.9, 3.10, 3.11, 3.12, 3.13 Signed-off-by: Mike Galbraith <bitbucket@online.de> Signed-off-by: Len Brown <len.brown@intel.com> --- diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index 3fb8d95ab8b5..c5db2a43e730 100644 --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -398,6 +398,52 @@ static void amd_e400_idle(void) default_idle(); } +/* + * Intel Core2 and older machines prefer MWAIT over HALT for C1. + * We can't rely on cpuidle installing MWAIT, because it will not load + * on systems that support only C1 -- so the boot default must be MWAIT. + * + * Some AMD machines are the opposite, they depend on using HALT. + * + * So for default C1, which is used during boot until cpuidle loads, + * use MWAIT-C1 on Intel HW that has it, else use HALT. + */ +static int prefer_mwait_c1_over_halt(const struct cpuinfo_x86 *c) +{ + if (c->x86_vendor != X86_VENDOR_INTEL) + return 0; + + if (!cpu_has(c, X86_FEATURE_MWAIT)) + return 0; + + return 1; +} + +/* + * MONITOR/MWAIT with no hints, used for default default C1 state. + * This invokes MWAIT with interrutps enabled and no flags, + * which is backwards compatible with the original MWAIT implementation. + */ + +static void mwait_idle(void) +{ + if (!current_set_polling_and_test()) { + if (static_cpu_has(X86_FEATURE_CLFLUSH_MONITOR)) { + mb(); + clflush((void *)¤t_thread_info()->flags); + mb(); + } + + __monitor((void *)¤t_thread_info()->flags, 0, 0); + if (!need_resched()) + __sti_mwait(0, 0); + else + local_irq_enable(); + } else + local_irq_enable(); + __current_clr_polling(); +} + void select_idle_routine(const struct cpuinfo_x86 *c) { #ifdef CONFIG_SMP @@ -411,6 +457,9 @@ void select_idle_routine(const struct cpuinfo_x86 *c) /* E400: APIC timer interrupt does not wake up CPU from C1e */ pr_info("using AMD E400 aware idle routine\n"); x86_idle = amd_e400_idle; + } else if (prefer_mwait_c1_over_halt(c)) { + pr_info("using mwait in idle threads\n"); + x86_idle = mwait_idle; } else x86_idle = default_idle; }
next prev parent reply other threads:[~2014-01-21 3:27 UTC|newest] Thread overview: 343+ messages / expand[flat|nested] mbox.gz Atom feed top 2014-01-16 3:58 Stephen Rothwell 2014-01-16 12:19 ` Peter Zijlstra 2014-01-16 20:46 ` Stephen Rothwell 2014-01-16 22:25 ` Peter Zijlstra 2014-01-16 22:34 ` Stephen Rothwell 2014-01-16 22:51 ` H. Peter Anvin 2014-01-17 3:45 ` Stephen Rothwell 2014-01-18 9:46 ` Mike Galbraith 2014-01-18 12:44 ` Peter Zijlstra 2014-01-18 14:06 ` Sabrina Dubroca 2014-01-18 15:21 ` Mike Galbraith 2014-01-18 19:14 ` H. Peter Anvin 2014-01-18 21:54 ` Peter Zijlstra 2014-01-20 3:51 ` Stephen Rothwell 2014-01-20 8:42 ` Sedat Dilek 2014-01-20 8:46 ` Sedat Dilek 2014-01-20 13:10 ` Stephen Rothwell 2014-01-20 15:28 ` Sedat Dilek 2014-01-20 9:17 ` Mike Galbraith 2014-01-20 9:25 ` Sedat Dilek 2014-01-20 9:48 ` Mike Galbraith 2014-01-20 4:45 ` Len Brown 2014-01-20 8:26 ` Peter Zijlstra 2014-01-20 8:56 ` H. Peter Anvin 2014-01-20 9:16 ` Peter Zijlstra 2014-01-20 9:23 ` H. Peter Anvin 2014-01-20 9:29 ` Ingo Molnar 2014-01-20 21:39 ` Len Brown 2014-01-20 21:51 ` Peter Zijlstra 2014-01-21 3:26 ` Mike Galbraith [this message] 2014-01-21 10:47 ` Ingo Molnar 2014-01-20 9:55 ` Peter Zijlstra 2014-01-20 11:00 ` H. Peter Anvin 2014-01-20 11:05 ` Peter Zijlstra 2014-01-16 20:56 ` H. Peter Anvin 2014-01-20 1:00 ` Len Brown 2014-01-20 1:07 ` H. Peter Anvin 2014-01-20 8:30 ` Peter Zijlstra 2014-01-20 10:13 ` Peter Zijlstra 2014-01-20 10:19 ` H. Peter Anvin 2014-01-20 11:06 ` Peter Zijlstra -- strict thread matches above, loose matches on Subject: below -- 2022-03-15 3:06 Stephen Rothwell 2022-03-15 5:23 ` Stephen Rothwell 2022-03-15 5:37 ` Stephen Rothwell 2022-03-15 8:42 ` Stephen Rothwell 2022-03-15 9:22 ` Peter Zijlstra 2022-03-15 10:41 ` Stephen Rothwell 2021-12-13 17:08 broonie 2021-11-26 3:52 Stephen Rothwell 2021-11-26 10:01 ` Arnd Bergmann 2021-12-01 22:05 ` Stephen Rothwell 2021-12-01 22:17 ` Thomas Gleixner 2021-12-01 22:19 ` Thomas Gleixner 2021-12-01 22:31 ` Stephen Rothwell 2021-10-25 4:11 Stephen Rothwell 2021-10-25 7:42 ` Borislav Petkov 2021-10-25 7:58 ` Stephen Rothwell 2021-10-25 8:37 ` Borislav Petkov 2021-10-28 5:10 ` Stephen Rothwell 2021-10-28 8:17 ` Borislav Petkov 2021-10-18 6:23 Stephen Rothwell 2021-10-18 6:45 ` Qi Zheng 2021-10-06 2:58 Stephen Rothwell 2021-10-06 9:31 ` Borislav Petkov 2021-10-06 9:54 ` Stephen Rothwell 2021-10-06 9:56 ` Borislav Petkov 2021-06-28 3:36 Stephen Rothwell 2021-06-28 5:42 ` Ingo Molnar 2021-05-13 2:05 Stephen Rothwell 2021-05-13 10:51 ` Ingo Molnar 2021-05-13 11:11 ` H. Peter Anvin 2021-03-22 3:37 Stephen Rothwell 2021-03-22 9:00 ` Borislav Petkov 2021-03-26 8:57 ` Sedat Dilek 2021-03-26 13:11 ` Borislav Petkov 2021-03-27 11:50 ` Sedat Dilek 2021-03-27 21:26 ` Stephen Rothwell 2021-03-23 8:34 ` Sedat Dilek 2021-03-17 4:08 Stephen Rothwell 2021-03-17 10:54 ` Borislav Petkov 2021-03-17 16:22 ` Ian Rogers 2021-03-17 18:02 ` Borislav Petkov 2021-03-17 18:49 ` Stephen Rothwell 2021-03-17 19:18 ` Borislav Petkov 2021-03-17 20:04 ` Ingo Molnar 2021-03-17 21:54 ` Stephen Rothwell 2021-03-02 23:38 Stephen Rothwell 2021-03-03 9:44 ` Peter Zijlstra 2021-03-03 11:29 ` Stephen Rothwell 2021-01-14 4:11 Stephen Rothwell 2021-01-14 10:07 ` Borislav Petkov 2020-11-27 4:10 Stephen Rothwell 2020-11-27 10:11 ` Ingo Molnar 2020-11-09 3:34 Stephen Rothwell 2020-10-09 4:28 Stephen Rothwell 2020-10-09 6:47 ` Vasily Gorbik 2020-09-08 9:12 Stephen Rothwell 2020-09-08 10:57 ` peterz 2020-09-03 2:35 Stephen Rothwell 2020-09-03 3:51 ` Ingo Molnar 2020-09-03 4:44 ` Stephen Rothwell 2020-08-03 5:45 Stephen Rothwell 2020-07-31 5:53 Stephen Rothwell 2020-07-31 9:57 ` Ingo Molnar 2020-07-31 10:02 ` Stephen Rothwell 2020-06-22 1:37 Stephen Rothwell 2020-06-30 2:54 ` Stephen Rothwell 2020-07-07 2:33 ` Stephen Rothwell 2020-07-14 3:50 ` Stephen Rothwell 2020-07-20 5:37 ` Stephen Rothwell 2020-06-21 6:33 Stephen Rothwell 2020-06-21 10:53 ` Borislav Petkov 2020-06-22 1:38 ` Stephen Rothwell 2020-05-21 17:31 Stephen Rothwell 2020-05-21 17:35 ` Will Deacon 2020-05-22 7:17 ` Stephen Rothwell 2020-05-22 7:49 ` Stephen Rothwell 2020-05-23 0:12 ` Paul E. McKenney 2020-05-23 6:46 ` Borislav Petkov 2020-05-23 9:54 ` Thomas Gleixner 2020-05-23 15:06 ` Paul E. McKenney 2020-05-23 19:05 ` Thomas Gleixner 2020-05-23 21:23 ` Paul E. McKenney 2020-05-25 0:37 ` Paul E. McKenney 2020-05-25 8:20 ` Marco Elver 2020-05-25 16:13 ` Paul E. McKenney 2020-05-15 6:00 Stephen Rothwell 2020-03-30 3:35 Stephen Rothwell 2020-03-30 3:53 ` H.J. Lu 2020-03-30 4:08 ` Stephen Rothwell 2020-03-30 7:48 ` Borislav Petkov 2020-03-30 8:04 ` Michael Ellerman 2020-03-30 8:16 ` Borislav Petkov 2020-03-30 11:34 ` H.J. Lu 2020-03-26 2:52 Stephen Rothwell 2020-03-26 10:59 ` Qais Yousef 2020-04-01 1:14 ` Stephen Rothwell 2020-04-03 8:15 ` Baolin Wang 2020-04-03 9:50 ` Sebastian Reichel 2019-11-21 3:54 Stephen Rothwell 2019-11-21 8:36 ` Peter Zijlstra 2019-11-21 18:37 ` Alex Deucher 2019-11-18 3:11 Stephen Rothwell 2019-11-18 9:49 ` Jiri Slaby 2019-11-18 12:49 ` Borislav Petkov 2019-10-21 2:13 Stephen Rothwell 2019-10-21 5:51 ` Ingo Molnar 2019-10-21 6:37 ` Stephen Rothwell 2019-10-10 2:14 Stephen Rothwell 2019-10-10 8:02 ` Ingo Molnar 2019-10-10 11:23 ` Stephen Rothwell 2019-10-10 13:44 ` Daniel Vetter 2019-11-06 2:53 ` Stephen Rothwell 2019-11-27 23:39 ` Stephen Rothwell 2019-08-29 6:20 Stephen Rothwell 2019-08-29 7:46 ` Peter Zijlstra 2019-08-29 12:24 ` Thomas Gleixner 2019-08-29 13:04 ` Peter Zijlstra 2019-08-08 4:48 Stephen Rothwell 2019-08-01 3:38 Stephen Rothwell 2019-07-09 6:54 Stephen Rothwell 2019-07-10 0:01 ` Stephen Rothwell 2019-07-10 18:21 ` Ilya Dryomov 2019-07-10 21:38 ` Stephen Rothwell 2019-07-02 5:33 Stephen Rothwell 2019-07-02 10:28 ` David Sterba 2019-07-02 12:57 ` Stephen Rothwell 2019-07-08 6:50 ` Stephen Rothwell 2019-06-25 6:04 Stephen Rothwell 2019-06-25 6:23 ` Kalle Valo 2019-06-25 6:26 ` Thomas Gleixner 2019-06-25 6:36 ` Stephen Rothwell 2019-06-25 6:51 ` Kalle Valo 2019-06-25 6:56 ` Thomas Gleixner 2019-06-25 7:47 ` Kalle Valo 2019-07-09 0:09 ` Stephen Rothwell 2019-07-09 3:46 ` Stephen Rothwell 2018-11-06 0:43 Stephen Rothwell 2018-08-08 23:24 Stephen Rothwell 2018-08-09 9:41 ` Joerg Roedel 2018-04-03 5:41 Stephen Rothwell 2018-04-03 9:30 ` Peter Zijlstra 2018-04-03 12:39 ` David Howells 2018-04-03 12:42 ` Peter Zijlstra 2018-04-03 12:41 ` David Howells 2017-11-08 2:47 Stephen Rothwell 2017-11-08 3:01 ` Josh Poimboeuf 2017-11-08 7:35 ` Stephen Rothwell 2017-11-08 9:18 ` Ingo Molnar 2017-11-08 12:14 ` Stephen Rothwell 2017-11-09 6:18 ` Ingo Molnar 2017-11-08 13:17 ` Josh Poimboeuf 2017-11-09 3:03 ` Stephen Rothwell 2017-11-01 10:51 Stephen Rothwell 2017-11-01 14:32 ` Kees Cook 2017-06-28 3:43 Stephen Rothwell 2017-06-28 4:00 ` jeffy 2017-06-28 4:24 ` Stephen Rothwell 2017-07-03 3:01 ` Stephen Rothwell 2017-05-02 3:17 Stephen Rothwell 2017-04-24 3:32 Stephen Rothwell 2017-04-24 5:31 ` Ingo Molnar 2017-04-05 3:36 Stephen Rothwell 2017-04-05 7:24 ` Mikko Perttunen 2016-12-07 1:37 Stephen Rothwell 2016-12-07 7:45 ` Ingo Molnar 2016-12-07 8:12 ` Jiri Olsa 2016-12-07 14:49 ` Arnaldo Carvalho de Melo 2016-12-07 18:56 ` Ingo Molnar 2016-12-07 20:32 ` Stephen Rothwell 2016-11-17 3:22 Stephen Rothwell 2016-09-29 3:20 Stephen Rothwell 2016-09-29 12:25 ` Rafael J. Wysocki 2016-09-29 15:54 ` Chen, Yu C 2016-09-29 20:50 ` Rafael J. Wysocki 2016-09-21 3:23 Stephen Rothwell 2016-09-21 6:44 ` Viresh Kumar 2016-07-18 8:29 Stephen Rothwell 2016-07-18 14:27 ` Paul Gortmaker 2016-07-18 5:15 Stephen Rothwell 2016-04-18 3:03 Stephen Rothwell 2016-04-14 2:14 Stephen Rothwell 2016-04-14 12:35 ` Arnaldo Carvalho de Melo 2016-04-14 12:55 ` Michael Ellerman 2016-04-14 15:08 ` Arnaldo Carvalho de Melo 2016-04-15 21:15 ` Arnaldo Carvalho de Melo 2016-04-15 21:28 ` Arnaldo Carvalho de Melo 2016-04-17 12:12 ` Jiri Olsa 2016-04-17 13:04 ` Jiri Olsa 2016-04-18 13:24 ` Arnaldo Carvalho de Melo 2016-04-18 13:28 ` Jiri Olsa 2016-03-01 1:29 Stephen Rothwell 2016-03-01 7:07 ` Ingo Molnar 2016-03-01 7:28 ` Sedat Dilek 2016-03-01 7:39 ` H. Peter Anvin 2016-03-01 8:41 ` Sedat Dilek 2016-03-01 9:45 ` Ingo Molnar 2016-03-01 9:40 ` Stephen Rothwell 2015-09-16 1:30 Stephen Rothwell 2015-09-16 4:53 ` David Miller 2015-09-16 0:12 Stephen Rothwell 2015-09-16 6:16 ` Jiri Olsa 2015-09-16 6:38 ` Jiri Olsa 2015-09-16 7:30 ` Stephen Rothwell 2015-09-16 14:17 ` Arnaldo Carvalho de Melo 2015-09-17 0:34 ` Stephen Rothwell 2015-09-30 2:56 ` Stephen Rothwell 2015-09-30 6:08 ` Jiri Olsa 2015-09-30 6:17 ` Stephen Rothwell 2015-07-28 5:33 Stephen Rothwell 2015-07-28 16:34 ` Luis R. Rodriguez 2015-07-28 18:17 ` Luis R. Rodriguez 2015-07-28 2:43 Stephen Rothwell 2015-07-28 8:41 ` Sudeep Holla 2015-07-28 9:43 ` Gregory CLEMENT 2015-07-15 1:01 Stephen Rothwell 2015-07-08 0:56 Stephen Rothwell 2015-07-08 9:40 ` Thomas Gleixner 2015-06-12 10:51 Michael Ellerman [not found] ` <BY1PR0701MB17063C25D627AF725A9E0D46FEBB0@BY1PR0701MB1706.namprd07.prod.outlook.com> 2015-06-12 21:22 ` David Miller 2015-06-12 21:25 ` Chickles, Derek 2015-06-09 7:15 Stephen Rothwell 2015-04-07 7:18 Stephen Rothwell 2015-04-07 8:48 ` Ingo Molnar 2015-04-07 8:56 ` Daniel Borkmann 2015-04-07 9:05 ` Stephen Rothwell 2015-04-07 11:13 ` Daniel Borkmann 2015-04-07 16:18 ` Alexei Starovoitov 2015-04-07 19:54 ` Daniel Borkmann 2015-04-08 5:03 ` Stephen Rothwell 2015-04-15 1:25 ` Stephen Rothwell 2015-04-07 8:53 ` Peter Zijlstra 2015-03-30 6:13 Stephen Rothwell 2015-03-30 7:15 ` Russell King - ARM Linux 2015-03-30 8:08 ` Stephen Rothwell 2015-03-30 14:57 ` Nathan Lynch 2015-03-30 15:08 ` Russell King - ARM Linux 2015-03-30 15:24 ` Nathan Lynch 2015-04-13 23:34 ` Stephen Rothwell 2014-07-25 4:45 Stephen Rothwell 2014-07-29 23:56 ` Stephen Rothwell 2014-07-30 3:10 ` John Stultz 2014-06-04 6:05 Stephen Rothwell 2014-06-04 10:49 ` Thomas Gleixner 2014-06-04 14:46 ` Linus Torvalds 2014-06-04 16:23 ` Olof Johansson 2014-06-04 20:02 ` Thomas Gleixner 2014-05-23 7:14 Stephen Rothwell 2014-05-29 1:38 ` Stephen Rothwell 2014-04-24 3:51 Stephen Rothwell 2014-02-12 2:41 Stephen Rothwell 2014-02-12 4:48 ` Preeti U Murthy 2014-02-11 3:00 Stephen Rothwell 2014-01-14 3:26 Stephen Rothwell 2014-01-14 14:14 ` Peter Zijlstra 2014-01-14 19:06 ` Mikulas Patocka 2014-01-14 20:05 ` Peter Zijlstra 2014-01-14 21:43 ` Mikulas Patocka 2014-01-14 22:03 ` Rafael J. Wysocki 2014-01-14 21:52 ` Mikulas Patocka 2014-01-14 22:18 ` Rafael J. Wysocki 2014-01-16 12:14 ` Peter Zijlstra 2013-10-28 9:24 Stephen Rothwell 2013-10-28 10:18 ` Thierry Reding 2013-10-28 10:26 ` Ingo Molnar 2013-10-29 6:00 ` Stephen Rothwell 2013-04-29 5:45 Stephen Rothwell 2013-02-14 2:30 Stephen Rothwell 2013-02-21 2:04 ` Stephen Rothwell 2013-02-02 5:04 Stephen Rothwell 2012-08-16 3:12 Stephen Rothwell 2012-08-16 19:46 ` Paul E. McKenney 2012-08-17 0:56 ` Stephen Rothwell 2012-08-17 11:50 ` Paul E. McKenney 2012-08-20 4:54 ` Stephen Rothwell 2012-08-20 15:09 ` Paul E. McKenney 2012-03-08 4:21 Stephen Rothwell 2012-03-08 18:00 ` Greg KH 2012-03-20 22:00 ` Stephen Rothwell 2012-03-20 22:32 ` Greg KH 2012-03-21 9:53 ` Alan Cox 2012-03-21 12:19 ` Alan Cox 2012-03-21 12:29 ` Stephen Rothwell 2012-02-24 3:47 Stephen Rothwell 2012-02-24 3:34 Stephen Rothwell 2011-10-05 6:25 Stephen Rothwell 2011-10-05 8:46 ` Peter Zijlstra 2011-10-11 6:15 ` Stephen Rothwell 2011-06-27 4:22 Stephen Rothwell 2011-06-28 10:55 ` Stijn Devriendt 2011-04-01 2:00 Stephen Rothwell 2011-01-31 4:42 Stephen Rothwell 2011-02-17 3:47 ` Stephen Rothwell 2011-02-17 13:18 ` Michal Marek 2011-02-17 15:02 ` Michal Marek 2011-02-17 17:11 ` Ingo Molnar 2011-02-17 22:47 ` Stephen Rothwell 2011-02-18 3:54 ` Stephen Rothwell 2010-10-19 5:13 Stephen Rothwell 2010-07-29 3:04 Stephen Rothwell 2010-05-10 4:49 Stephen Rothwell 2010-05-10 5:09 ` H. Peter Anvin 2010-03-12 4:00 Stephen Rothwell
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