From: Valentin Schneider <valentin.schneider@arm.com> To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Peter Zijlstra <peterz@infradead.org>, Dietmar Eggemann <dietmar.eggemann@arm.com>, mingo@kernel.org, vincent.guittot@linaro.org, morten.rasmussen@arm.com, Quentin Perret <qperret@google.com> Subject: [PATCH v6 09/17] sched/topology: Remove SD_SERIALIZE degeneration special case Date: Mon, 17 Aug 2020 12:29:55 +0100 [thread overview] Message-ID: <20200817113003.20802-10-valentin.schneider@arm.com> (raw) In-Reply-To: <20200817113003.20802-1-valentin.schneider@arm.com> If there is only a single NUMA node in the system, the only NUMA topology level that will be generated will be NODE (identity distance), which doesn't have SD_SERIALIZE. This means we don't need this special case in sd_parent_degenerate(), as having the NODE level "naturally" covers it. Thus, remove it. Suggested-by: Peter Zijlstra <peterz@infradead.org> Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com> Signed-off-by: Valentin Schneider <valentin.schneider@arm.com> --- kernel/sched/topology.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c index 5f2bc99ff659..00ad7cef2ec1 100644 --- a/kernel/sched/topology.c +++ b/kernel/sched/topology.c @@ -183,11 +183,9 @@ sd_parent_degenerate(struct sched_domain *sd, struct sched_domain *parent) return 0; /* Flags needing groups don't count if only 1 group in parent */ - if (parent->groups == parent->groups->next) { + if (parent->groups == parent->groups->next) pflags &= ~(SD_DEGENERATE_GROUPS_MASK | SD_PREFER_SIBLING); - if (nr_node_ids == 1) - pflags &= ~SD_SERIALIZE; - } + if (~cflags & pflags) return 0; -- 2.27.0
WARNING: multiple messages have this Message-ID (diff)
From: Valentin Schneider <valentin.schneider@arm.com> To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: mingo@kernel.org, vincent.guittot@linaro.org, Quentin Perret <qperret@google.com>, Peter Zijlstra <peterz@infradead.org>, morten.rasmussen@arm.com, Dietmar Eggemann <dietmar.eggemann@arm.com> Subject: [PATCH v6 09/17] sched/topology: Remove SD_SERIALIZE degeneration special case Date: Mon, 17 Aug 2020 12:29:55 +0100 [thread overview] Message-ID: <20200817113003.20802-10-valentin.schneider@arm.com> (raw) In-Reply-To: <20200817113003.20802-1-valentin.schneider@arm.com> If there is only a single NUMA node in the system, the only NUMA topology level that will be generated will be NODE (identity distance), which doesn't have SD_SERIALIZE. This means we don't need this special case in sd_parent_degenerate(), as having the NODE level "naturally" covers it. Thus, remove it. Suggested-by: Peter Zijlstra <peterz@infradead.org> Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com> Signed-off-by: Valentin Schneider <valentin.schneider@arm.com> --- kernel/sched/topology.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c index 5f2bc99ff659..00ad7cef2ec1 100644 --- a/kernel/sched/topology.c +++ b/kernel/sched/topology.c @@ -183,11 +183,9 @@ sd_parent_degenerate(struct sched_domain *sd, struct sched_domain *parent) return 0; /* Flags needing groups don't count if only 1 group in parent */ - if (parent->groups == parent->groups->next) { + if (parent->groups == parent->groups->next) pflags &= ~(SD_DEGENERATE_GROUPS_MASK | SD_PREFER_SIBLING); - if (nr_node_ids == 1) - pflags &= ~SD_SERIALIZE; - } + if (~cflags & pflags) return 0; -- 2.27.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-08-17 11:30 UTC|newest] Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-08-17 11:29 [PATCH v6 00/17] sched: Instrument sched domain flags Valentin Schneider 2020-08-17 11:29 ` Valentin Schneider 2020-08-17 11:29 ` [PATCH v6 01/17] ARM, sched/topology: Remove SD_SHARE_POWERDOMAIN Valentin Schneider 2020-08-17 11:29 ` Valentin Schneider 2020-08-19 14:02 ` [tip: sched/core] " tip-bot2 for Valentin Schneider 2020-08-17 11:29 ` [PATCH v6 02/17] ARM: Revert back to default scheduler topology Valentin Schneider 2020-08-17 11:29 ` Valentin Schneider 2020-08-19 14:02 ` [tip: sched/core] ARM, sched/topology: " tip-bot2 for Valentin Schneider 2020-08-17 11:29 ` [PATCH v6 03/17] sched/topology: Split out SD_* flags declaration to its own file Valentin Schneider 2020-08-17 11:29 ` Valentin Schneider 2020-08-19 14:02 ` [tip: sched/core] " tip-bot2 for Valentin Schneider 2020-08-17 11:29 ` [PATCH v6 04/17] sched/topology: Define and assign sched_domain flag metadata Valentin Schneider 2020-08-17 11:29 ` Valentin Schneider 2020-08-19 14:02 ` [tip: sched/core] " tip-bot2 for Valentin Schneider 2020-08-17 11:29 ` [PATCH v6 05/17] sched/topology: Verify SD_* flags setup when sched_debug is on Valentin Schneider 2020-08-17 11:29 ` Valentin Schneider 2020-08-19 14:02 ` [tip: sched/core] " tip-bot2 for Valentin Schneider 2020-08-17 11:29 ` [PATCH v6 06/17] sched/debug: Output SD flag names rather than their values Valentin Schneider 2020-08-17 11:29 ` Valentin Schneider 2020-08-19 14:02 ` [tip: sched/core] " tip-bot2 for Valentin Schneider 2020-08-17 11:29 ` [PATCH v6 07/17] sched/topology: Introduce SD metaflag for flags needing > 1 groups Valentin Schneider 2020-08-17 11:29 ` Valentin Schneider 2020-08-19 14:02 ` [tip: sched/core] " tip-bot2 for Valentin Schneider 2020-08-17 11:29 ` [PATCH v6 08/17] sched/topology: Use prebuilt SD flag degeneration mask Valentin Schneider 2020-08-17 11:29 ` Valentin Schneider 2020-08-19 14:02 ` [tip: sched/core] " tip-bot2 for Valentin Schneider 2020-08-17 11:29 ` Valentin Schneider [this message] 2020-08-17 11:29 ` [PATCH v6 09/17] sched/topology: Remove SD_SERIALIZE degeneration special case Valentin Schneider 2020-08-19 14:02 ` [tip: sched/core] " tip-bot2 for Valentin Schneider 2020-08-17 11:29 ` [PATCH v6 10/17] sched/topology: Propagate SD_ASYM_CPUCAPACITY upwards Valentin Schneider 2020-08-17 11:29 ` Valentin Schneider 2020-08-19 14:02 ` [tip: sched/core] " tip-bot2 for Valentin Schneider 2020-08-17 11:29 ` [PATCH v6 11/17] sched/topology: Mark SD_PREFER_SIBLING as SDF_NEEDS_GROUPS Valentin Schneider 2020-08-17 11:29 ` Valentin Schneider 2020-08-19 14:02 ` [tip: sched/core] " tip-bot2 for Valentin Schneider 2020-08-17 11:29 ` [PATCH v6 12/17] sched/topology: Mark SD_BALANCE_WAKE " Valentin Schneider 2020-08-17 11:29 ` Valentin Schneider 2020-08-19 14:02 ` [tip: sched/core] " tip-bot2 for Valentin Schneider 2020-08-17 11:29 ` [PATCH v6 13/17] sched/topology: Mark SD_SERIALIZE " Valentin Schneider 2020-08-17 11:29 ` Valentin Schneider 2020-08-19 14:02 ` [tip: sched/core] " tip-bot2 for Valentin Schneider 2020-08-17 11:30 ` [PATCH v6 14/17] sched/topology: Mark SD_ASYM_PACKING " Valentin Schneider 2020-08-17 11:30 ` Valentin Schneider 2020-08-19 14:02 ` [tip: sched/core] " tip-bot2 for Valentin Schneider 2020-08-17 11:30 ` [PATCH v6 15/17] sched/topology: Mark SD_OVERLAP " Valentin Schneider 2020-08-17 11:30 ` Valentin Schneider 2020-08-19 14:02 ` [tip: sched/core] " tip-bot2 for Valentin Schneider 2020-08-17 11:30 ` [PATCH v6 16/17] sched/topology: Mark SD_NUMA " Valentin Schneider 2020-08-17 11:30 ` Valentin Schneider 2020-08-19 14:02 ` [tip: sched/core] " tip-bot2 for Valentin Schneider 2020-08-17 11:30 ` [PATCH v6 17/17] sched/topology: Expand use of SD_DEGENERATE_GROUPS_MASK to flags not needing groups Valentin Schneider 2020-08-17 11:30 ` Valentin Schneider
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