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From: Srikar Dronamraju <srikar@linux.ibm.com>
To: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
	Peter Zijlstra <peterz@infradead.org>
Cc: Ben Segall <bsegall@google.com>,
	Christophe Leroy <christophe.leroy@csgroup.eu>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>,
	Ingo Molnar <mingo@kernel.org>,
	Juri Lelli <juri.lelli@redhat.com>,
	K Prateek Nayak <kprateek.nayak@amd.com>,
	Madhavan Srinivasan <maddy@linux.ibm.com>,
	Mel Gorman <mgorman@suse.de>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Nicholas Piggin <npiggin@gmail.com>,
	Shrikanth Hegde <sshegde@linux.ibm.com>,
	Srikar Dronamraju <srikar@linux.ibm.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Swapnil Sapkal <swapnil.sapkal@amd.com>,
	Thomas Huth <thuth@redhat.com>,
	Valentin Schneider <vschneid@redhat.com>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	virtualization@lists.linux.dev,
	Yicong Yang <yangyicong@hisilicon.com>,
	Ilya Leoshkevich <iii@linux.ibm.com>
Subject: [PATCH 02/17] powerpc/lpar: Reorder steal accounting calculation
Date: Thu,  4 Dec 2025 23:23:50 +0530	[thread overview]
Message-ID: <20251204175405.1511340-3-srikar@linux.ibm.com> (raw)
In-Reply-To: <20251204175405.1511340-1-srikar@linux.ibm.com>

There is no functional change. Calculated steal could be used in the
subsequent changes. Hence reordering the function.

Signed-off-by: Srikar Dronamraju <srikar@linux.ibm.com>
---
 arch/powerpc/platforms/pseries/lpar.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c
index 6a415febc53b..dde12b27ba60 100644
--- a/arch/powerpc/platforms/pseries/lpar.c
+++ b/arch/powerpc/platforms/pseries/lpar.c
@@ -662,15 +662,20 @@ machine_device_initcall(pseries, vcpudispatch_stats_procfs_init);
 u64 pseries_paravirt_steal_clock(int cpu)
 {
 	struct lppaca *lppaca = &lppaca_of(cpu);
+	unsigned long steal;
+
+	steal = be64_to_cpu(READ_ONCE(lppaca->ready_enqueue_tb));
+	steal += be64_to_cpu(READ_ONCE(lppaca->enqueue_dispatch_tb));
 
 	/*
 	 * VPA steal time counters are reported at TB frequency. Hence do a
-	 * conversion to ns before returning
+	 * conversion to ns before using.
 	 */
-	return tb_to_ns(be64_to_cpu(READ_ONCE(lppaca->enqueue_dispatch_tb)) +
-			be64_to_cpu(READ_ONCE(lppaca->ready_enqueue_tb)));
+	steal = tb_to_ns(steal);
+
+	return steal;
 }
-#endif
+#endif /* CONFIG_PARAVIRT_TIME_ACCOUNTING */
 
 #endif /* CONFIG_PPC_SPLPAR */
 
-- 
2.43.7


  parent reply	other threads:[~2025-12-04 17:55 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-12-04 17:53 [PATCH 00/17] Steal time based dynamic CPU resource management Srikar Dronamraju
2025-12-04 17:53 ` [PATCH 01/17] sched/fair: Enable group_asym_packing in find_idlest_group Srikar Dronamraju
2025-12-04 17:53 ` Srikar Dronamraju [this message]
2025-12-04 17:53 ` [PATCH 03/17] pseries/lpar: Process steal metrics Srikar Dronamraju
2025-12-04 17:53 ` [PATCH 04/17] powerpc/smp: Add num_available_cores callback for smp_ops Srikar Dronamraju
2025-12-04 17:53 ` [PATCH 05/17] pseries/smp: Query and set entitlements Srikar Dronamraju
2025-12-04 17:53 ` [PATCH 06/17] powerpc/smp: Delay processing steal time at boot Srikar Dronamraju
2025-12-04 17:53 ` [PATCH 07/17] sched/core: Set balance_callback only if CPU is dying Srikar Dronamraju
2025-12-04 17:53 ` [PATCH 08/17] sched/core: Implement CPU soft offline/online Srikar Dronamraju
2025-12-05 16:03   ` Peter Zijlstra
2025-12-05 18:54     ` Srikar Dronamraju
2025-12-05 16:07   ` Peter Zijlstra
2025-12-05 18:57     ` Srikar Dronamraju
2025-12-04 17:53 ` [PATCH 09/17] powerpc/smp: Implement arch_scale_cpu_capacity for shared LPARs Srikar Dronamraju
2025-12-04 17:53 ` [PATCH 10/17] powerpc/smp: Define arch_update_cpu_topology " Srikar Dronamraju
2025-12-04 17:53 ` [PATCH 11/17] pseries/smp: Create soft offline infrastructure for Powerpc " Srikar Dronamraju
2025-12-04 17:54 ` [PATCH 12/17] pseries/smp: Trigger softoffline based on steal metrics Srikar Dronamraju
2025-12-04 17:54 ` [PATCH 13/17] pseries/smp: Account cores when triggering softoffline Srikar Dronamraju
2025-12-04 17:54 ` [PATCH 14/17] powerpc/smp: Assume preempt if CPU is inactive Srikar Dronamraju
2025-12-04 17:54 ` [PATCH 15/17] pseries/hotplug: Update available_cores on a dlpar event Srikar Dronamraju
2025-12-04 17:54 ` [PATCH 16/17] pseries/smp: Allow users to override steal thresholds Srikar Dronamraju
2025-12-04 17:54 ` [PATCH 17/17] pseries/lpar: Add debug interface to set steal interval Srikar Dronamraju

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