Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752937Ab2J2JkR (ORCPT ); Mon, 29 Oct 2012 05:40:17 -0400 Received: from mail-la0-f46.google.com ([209.85.215.46]:50791 "EHLO mail-la0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751075Ab2J2JkP (ORCPT ); Mon, 29 Oct 2012 05:40:15 -0400 MIME-Version: 1.0 In-Reply-To: <5088066D.7000907@ti.com> References: <1349595838-31274-1-git-send-email-vincent.guittot@linaro.org> <1349595838-31274-3-git-send-email-vincent.guittot@linaro.org> <5088066D.7000907@ti.com> Date: Mon, 29 Oct 2012 10:40:13 +0100 Message-ID: Subject: Re: [RFC 2/6] sched: add a new SD SHARE_POWERLINE flag for sched_domain From: Vincent Guittot To: Santosh Shilimkar Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linaro-dev@lists.linaro.org, peterz@infradead.org, mingo@redhat.com, pjt@google.com, linux@arm.linux.org.uk Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3704 Lines: 81 On 24 October 2012 17:17, Santosh Shilimkar wrote: > Vincent, > > Few comments/questions. > > > On Sunday 07 October 2012 01:13 PM, Vincent Guittot wrote: >> >> This new flag SD SHARE_POWERLINE reflects the sharing of the power rail >> between the members of a domain. As this is the current assumption of the >> scheduler, the flag is added to all sched_domain >> >> Signed-off-by: Vincent Guittot >> --- >> arch/ia64/include/asm/topology.h | 1 + >> arch/tile/include/asm/topology.h | 1 + >> include/linux/sched.h | 1 + >> include/linux/topology.h | 3 +++ >> kernel/sched/core.c | 5 +++++ >> 5 files changed, 11 insertions(+) >> >> diff --git a/arch/ia64/include/asm/topology.h >> b/arch/ia64/include/asm/topology.h >> index a2496e4..065c720 100644 >> --- a/arch/ia64/include/asm/topology.h >> +++ b/arch/ia64/include/asm/topology.h >> @@ -65,6 +65,7 @@ void build_cpu_to_node_map(void); >> | SD_BALANCE_EXEC \ >> | SD_BALANCE_FORK \ >> | SD_WAKE_AFFINE, \ >> + | arch_sd_share_power_line() \ >> .last_balance = jiffies, \ >> .balance_interval = 1, \ >> .nr_balance_failed = 0, \ >> diff --git a/arch/tile/include/asm/topology.h >> b/arch/tile/include/asm/topology.h >> index 7a7ce39..d39ed0b 100644 >> --- a/arch/tile/include/asm/topology.h >> +++ b/arch/tile/include/asm/topology.h >> @@ -72,6 +72,7 @@ static inline const struct cpumask *cpumask_of_node(int >> node) >> | 0*SD_PREFER_LOCAL \ >> | 0*SD_SHARE_CPUPOWER \ >> | 0*SD_SHARE_PKG_RESOURCES \ >> + | arch_sd_share_power_line() \ >> | 0*SD_SERIALIZE \ >> , \ >> .last_balance = jiffies, \ >> diff --git a/include/linux/sched.h b/include/linux/sched.h >> index 4786b20..74f2daf 100644 >> --- a/include/linux/sched.h >> +++ b/include/linux/sched.h >> @@ -862,6 +862,7 @@ enum cpu_idle_type { >> #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU >> */ >> #define SD_PREFER_LOCAL 0x0040 /* Prefer to keep tasks >> local to this domain */ >> #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power >> */ >> +#define SD_SHARE_POWERLINE 0x0100 /* Domain members share power >> domain */ > > If you ignore the current use of SD_SHARE_CPUPOWER, isn't the meaning of > CPUPOWER and POWERLINE is same here. Just trying to understand the clear > meaning of this new flag. Have you not considered SD_SHARE_CPUPOWER > because it is being used for cpu_power and needs at least minimum two > domains ? SD_PACKING would have been probably more appropriate based > on the way it is being used in further series. CPUPOWER reflects the share of hw ressources between cores like for hyper threading. POWERLINE describes the fact that cores are sharing the same power line amore precisely the powergate. > > Regards > Santosh > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/