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Commit 7c16ec58 authored by Mike Travis's avatar Mike Travis Committed by Ingo Molnar
Browse files

cpumask: reduce stack usage in SD_x_INIT initializers 



  * Remove empty cpumask_t (and all non-zero/non-null) variables
    in SD_*_INIT macros.  Use memset(0) to clear.  Also, don't
    inline the initializer functions to save on stack space in
    build_sched_domains().

  * Merge change to include/linux/topology.h that uses the new
    node_to_cpumask_ptr function in the nr_cpus_node macro into
    this patch.

Depends on:
	[mm-patch]: asm-generic-add-node_to_cpumask_ptr-macro.patch
	[sched-devel]: sched: add new set_cpus_allowed_ptr function

Cc: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: default avatarMike Travis <travis@sgi.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent c5f59f08

include/asm-x86/topology.h

+0 −5
Original line number Diff line number Diff line
@@ -154,10 +154,6 @@ extern unsigned long node_remap_size[]; 


/* sched_domains SD_NODE_INIT for NUMAQ machines */

#define SD_NODE_INIT (struct sched_domain) {		\

	.span			= CPU_MASK_NONE,	\

	.parent			= NULL,			\

	.child			= NULL,			\

	.groups			= NULL,			\

	.min_interval		= 8,			\

	.max_interval		= 32,			\

	.busy_factor		= 32,			\
@@ -175,7 +171,6 @@ extern unsigned long node_remap_size[]; 
				| SD_WAKE_BALANCE,	\

	.last_balance		= jiffies,		\

	.balance_interval	= 1,			\

	.nr_balance_failed	= 0,			\

}



#ifdef CONFIG_X86_64_ACPI_NUMA

include/linux/topology.h

+8 −38
Original line number Diff line number Diff line
@@ -40,9 +40,8 @@ 
#ifndef nr_cpus_node

#define nr_cpus_node(node)				\

	({						\

		cpumask_t __tmp__;						\

		__tmp__ = node_to_cpumask(node);				\

		cpus_weight(__tmp__);						\

		node_to_cpumask_ptr(__tmp__, node);	\

		cpus_weight(*__tmp__);			\

	})

#endif
@@ -80,7 +79,9 @@ void arch_update_cpu_topology(void); 
 * by defining their own arch-specific initializer in include/asm/topology.h.

 * A definition there will automagically override these default initializers

 * and allow arch-specific performance tuning of sched_domains.

 * (Only non-zero and non-null fields need be specified.)

 */



#ifdef CONFIG_SCHED_SMT

/* MCD - Do we really need this?  It is always on if CONFIG_SCHED_SMT is,

 * so can't we drop this in favor of CONFIG_SCHED_SMT?
@@ -89,20 +90,10 @@ void arch_update_cpu_topology(void); 
/* Common values for SMT siblings */

#ifndef SD_SIBLING_INIT

#define SD_SIBLING_INIT (struct sched_domain) {		\

	.span			= CPU_MASK_NONE,	\

	.parent			= NULL,			\

	.child			= NULL,			\

	.groups			= NULL,			\

	.min_interval		= 1,			\

	.max_interval		= 2,			\

	.busy_factor		= 64,			\

	.imbalance_pct		= 110,			\

	.cache_nice_tries	= 0,			\

	.busy_idx		= 0,			\

	.idle_idx		= 0,			\

	.newidle_idx		= 0,			\

	.wake_idx		= 0,			\

	.forkexec_idx		= 0,			\

	.flags			= SD_LOAD_BALANCE	\

				| SD_BALANCE_NEWIDLE	\

				| SD_BALANCE_FORK	\
@@ -112,7 +103,6 @@ void arch_update_cpu_topology(void); 
				| SD_SHARE_CPUPOWER,	\

	.last_balance		= jiffies,		\

	.balance_interval	= 1,			\

	.nr_balance_failed	= 0,			\

}

#endif

#endif /* CONFIG_SCHED_SMT */
@@ -121,18 +111,12 @@ void arch_update_cpu_topology(void); 
/* Common values for MC siblings. for now mostly derived from SD_CPU_INIT */

#ifndef SD_MC_INIT

#define SD_MC_INIT (struct sched_domain) {		\

	.span			= CPU_MASK_NONE,	\

	.parent			= NULL,			\

	.child			= NULL,			\

	.groups			= NULL,			\

	.min_interval		= 1,			\

	.max_interval		= 4,			\

	.busy_factor		= 64,			\

	.imbalance_pct		= 125,			\

	.cache_nice_tries	= 1,			\

	.busy_idx		= 2,			\

	.idle_idx		= 0,			\

	.newidle_idx		= 0,			\

	.wake_idx		= 1,			\

	.forkexec_idx		= 1,			\

	.flags			= SD_LOAD_BALANCE	\
@@ -144,7 +128,6 @@ void arch_update_cpu_topology(void); 
				| BALANCE_FOR_MC_POWER,	\

	.last_balance		= jiffies,		\

	.balance_interval	= 1,			\

	.nr_balance_failed	= 0,			\

}

#endif

#endif /* CONFIG_SCHED_MC */
@@ -152,10 +135,6 @@ void arch_update_cpu_topology(void); 
/* Common values for CPUs */

#ifndef SD_CPU_INIT

#define SD_CPU_INIT (struct sched_domain) {		\

	.span			= CPU_MASK_NONE,	\

	.parent			= NULL,			\

	.child			= NULL,			\

	.groups			= NULL,			\

	.min_interval		= 1,			\

	.max_interval		= 4,			\

	.busy_factor		= 64,			\
@@ -174,16 +153,11 @@ void arch_update_cpu_topology(void); 
				| BALANCE_FOR_PKG_POWER,\

	.last_balance		= jiffies,		\

	.balance_interval	= 1,			\

	.nr_balance_failed	= 0,			\

}

#endif



/* sched_domains SD_ALLNODES_INIT for NUMA machines */

#define SD_ALLNODES_INIT (struct sched_domain) {	\

	.span			= CPU_MASK_NONE,	\

	.parent			= NULL,			\

	.child			= NULL,			\

	.groups			= NULL,			\

	.min_interval		= 64,			\

	.max_interval		= 64*num_online_cpus(),	\

	.busy_factor		= 128,			\
@@ -191,14 +165,10 @@ void arch_update_cpu_topology(void); 
	.cache_nice_tries	= 1,			\

	.busy_idx		= 3,			\

	.idle_idx		= 3,			\

	.newidle_idx		= 0, /* unused */	\

	.wake_idx		= 0, /* unused */	\

	.forkexec_idx		= 0, /* unused */	\

	.flags			= SD_LOAD_BALANCE	\

				| SD_SERIALIZE,	\

	.last_balance		= jiffies,		\

	.balance_interval	= 64,			\

	.nr_balance_failed	= 0,			\

}



#ifdef CONFIG_NUMA

kernel/sched.c

+248 −120

File changed.

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