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Commit d3d37d85 authored by Tim Chen's avatar Tim Chen Committed by Thomas Gleixner
Browse files

x86/sched: Add SD_ASYM_PACKING flags to x86 ITMT CPU 



Some Intel cores in a package can be boosted to a higher turbo frequency
with ITMT 3.0 technology. The scheduler can use the asymmetric packing
feature to move tasks to the more capable cores.

If ITMT is enabled, add SD_ASYM_PACKING flag to the thread and core
sched domains to enable asymmetric packing.

Co-developed-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: default avatarTim Chen <tim.c.chen@linux.intel.com>
Cc: linux-pm@vger.kernel.org
Cc: peterz@infradead.org
Cc: jolsa@redhat.com
Cc: rjw@rjwysocki.net
Cc: linux-acpi@vger.kernel.org
Cc: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Cc: bp@suse.de
Link: http://lkml.kernel.org/r/9bbb885bedbef4eb50e197305eb16b160cff0831.1479844244.git.tim.c.chen@linux.intel.com


Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent f9793e34

arch/x86/kernel/smpboot.c

+24 −4
Original line number Diff line number Diff line
@@ -482,22 +482,42 @@ static bool match_die(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o) 
	return false;

}



#if defined(CONFIG_SCHED_SMT) || defined(CONFIG_SCHED_MC)

static inline int x86_sched_itmt_flags(void)

{

	return sysctl_sched_itmt_enabled ? SD_ASYM_PACKING : 0;

}



#ifdef CONFIG_SCHED_MC

static int x86_core_flags(void)

{

	return cpu_core_flags() | x86_sched_itmt_flags();

}

#endif

#ifdef CONFIG_SCHED_SMT

static int x86_smt_flags(void)

{

	return cpu_smt_flags() | x86_sched_itmt_flags();

}

#endif

#endif



static struct sched_domain_topology_level x86_numa_in_package_topology[] = {

#ifdef CONFIG_SCHED_SMT

	{ cpu_smt_mask, cpu_smt_flags, SD_INIT_NAME(SMT) },

	{ cpu_smt_mask, x86_smt_flags, SD_INIT_NAME(SMT) },

#endif

#ifdef CONFIG_SCHED_MC

	{ cpu_coregroup_mask, cpu_core_flags, SD_INIT_NAME(MC) },

	{ cpu_coregroup_mask, x86_core_flags, SD_INIT_NAME(MC) },

#endif

	{ NULL, },

};



static struct sched_domain_topology_level x86_topology[] = {

#ifdef CONFIG_SCHED_SMT

	{ cpu_smt_mask, cpu_smt_flags, SD_INIT_NAME(SMT) },

	{ cpu_smt_mask, x86_smt_flags, SD_INIT_NAME(SMT) },

#endif

#ifdef CONFIG_SCHED_MC

	{ cpu_coregroup_mask, cpu_core_flags, SD_INIT_NAME(MC) },

	{ cpu_coregroup_mask, x86_core_flags, SD_INIT_NAME(MC) },

#endif

	{ cpu_cpu_mask, SD_INIT_NAME(DIE) },

	{ NULL, },