: O(1) 2.4.17-J7 Tuneable Parameters
Subsystems (2)
PATCH 1/1 : O(1) 2.4.17-J7 Tuneable Parameters
Hi Ingo,
This patch synchronizes with J7 and I think makes the changes
you wished. A couple of important points:
- This patch can be applied to EITHER 2.4.17 OR 2.4.18 pre 7 as long as Ingo's J7 patch is applied first.
- While I agree with you on not wanting these in the mainline kernel, I ran Hackbench on one of our new Foster systems with and without the tuneable parameters, and while the numbers do degrade slightly, its rather suprisingly small. So dont be afraid to use this as a system tuning aid.
Signature · 4 lines
Jack F. Vogel IBM Linux Solutions [email protected] (work) [email protected] (home)
include/linux/sched.h +29 -12
@@ -472,20 +472,37 @@#define DEF_USER_NICE 0/* -* Default timeslice is 250 msecs, maximum is 500 msecs. +* Default timeslice is now HZ, maximum is 300 msecs. * Minimum timeslice is 10 msecs. */ -#define MIN_TIMESLICE ( 10 * HZ / 1000) -#define MAX_TIMESLICE (300 * HZ / 1000) -#define CHILD_FORK_PENALTY 95 -#define PARENT_FORK_PENALTY 100 -#define EXIT_WEIGHT 3 -#define PRIO_INTERACTIVE_RATIO 20 -#define PRIO_CPU_HOG_RATIO 60 -#define PRIO_BONUS_RATIO 70 -#define INTERACTIVE_DELTA 3 -#define MAX_SLEEP_AVG (2*HZ) -#define STARVATION_LIMIT (2*HZ) +#define DEFAULT_MIN_TIMESLICE ( 10 * HZ / 1000) +#define DEFAULT_MAX_TIMESLICE (300 * HZ / 1000) +#define DEFAULT_CHILD_FORK_PENALTY 95 +#define DEFAULT_PARENT_FORK_PENALTY 100 +#define DEFAULT_EXIT_WEIGHT 3 +#define DEFAULT_PRIO_INTERACTIVE_RATIO 20 +#define DEFAULT_PRIO_CPU_HOG_RATIO 60 +#define DEFAULT_PRIO_BONUS_RATIO 70 +#define DEFAULT_INTERACTIVE_DELTA 3 +#define DEFAULT_MAX_SLEEP_AVG (2*HZ) +#define DEFAULT_STARVATION_LIMIT (2*HZ) + +extern int min_timeslice, max_timeslice, child_fork_penalty; +extern int parent_fork_penalty, prio_cpu_hog_ratio, prio_bonus_ratio; +extern int exit_weight, prio_bonus_ratio, interactive_delta; +extern int max_sleep_avg, starvation_limit; + +#define MIN_TIMESLICE (min_timeslice) +#define MAX_TIMESLICE (max_timeslice) +#define CHILD_FORK_PENALTY (child_fork_penalty) +#define PARENT_FORK_PENALTY (parent_fork_penalty) +#define PRIO_INTERACTIVE_RATIO (prio_interactive_ratio) +#define PRIO_CPU_HOG_RATIO (prio_cpu_hog_ratio) +#define PRIO_BONUS_RATIO (prio_bonus_ratio) +#define INTERACTIVE_DELTA (interactive_delta) +#define EXIT_WEIGHT (exit_weight) +#define MAX_SLEEP_AVG (max_sleep_avg) +#define STARVATION_LIMIT (starvation_limit)#define USER_PRIO (p) ((p)-MAX_RT_PRIO)#define MAX_USER_PRIO (USER_PRIO(MAX_PRIO))
include/linux/sysctl.h +18 -1
@@ -63,7 +63,8 @@CTL_DEV =7 ,/* Devices */ CTL_BUS =8 ,/* Busses */ CTL_ABI =9 ,/* Binary emulation */ - CTL_CPU=10 /* CPU stuff (speed scaling, etc) */ +CTL_CPU =10 ,/* CPU stuff (speed scaling, etc) */ + CTL_SCHED=11 /* SCHED ctl (tuneable parameters) */ };/* CTL_BUS names: */
@@ -72,6 +73,22 @@BUS_ISA =1 /* ISA */ }; +/* CTL_SCHED names: */ +enum +{ +MAX_SLICE =1 ,/* Timeslice scaling */ +MIN_SLICE =2 , +CHILD_PENALTY =3 , +PARENT_PENALTY =4 , +INT_RATIO =5 , +HOG_RATIO =6 , +BONUS_RATIO =7 , +INT_DELTA =8 , +EWEIGHT =9 , +MAX_SLEEP =10 , +STARVE_LIM =11 +}; +/* CTL_KERN names: */ enum {
kernel/sched.c +16 -0
@@ -22,6 +22,22 @@#define BITMAP_SIZE ((((MAX_PRIO+7)/8)+sizeof(long)-1)/sizeof(long)) +/* +** Tuneable scheduler parameters, +** brought out in /proc/sys/sched +*/ +int max_timeslice =DEFAULT_MAX_TIMESLICE ; +int min_timeslice =DEFAULT_MIN_TIMESLICE ; +int child_fork_penalty =DEFAULT_CHILD_FORK_PENALTY ; +int parent_fork_penalty =DEFAULT_PARENT_FORK_PENALTY ; +int prio_interactive_ratio =DEFAULT_PRIO_INTERACTIVE_RATIO ; +int prio_cpu_hog_ratio =DEFAULT_PRIO_CPU_HOG_RATIO ; +int prio_bonus_ratio =DEFAULT_PRIO_BONUS_RATIO ; +int interactive_delta =DEFAULT_INTERACTIVE_DELTA ; +int exit_weight =DEFAULT_EXIT_WEIGHT ; +int max_sleep_avg =DEFAULT_MAX_SLEEP_AVG ; +int starvation_limit =DEFAULT_STARVATION_LIMIT ; +typedef struct runqueue runqueue_t ;struct prio_array {
kernel/sysctl.c +32 -1
@@ -50,7 +50,9 @@extern int sysrq_enabled;extern int core_uses_pid;extern int cad_pid; - +extern int child_fork_penalty, parent_fork_penalty,prio_interactive_ratio; +extern int prio_cpu_hog_ratio, prio_bonus_ratio, interactive_delta; +extern int exit_weight, max_sleep_avg, starvation_limit;/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ static int maxolduid =65535 ;static int minolduid;
@@ -109,6 +111,7 @@static ctl_table kern_table[];static ctl_table vm_table[]; +static ctl_table sched_table[];#ifdef CONFIG_NET extern ctl_table net_table[];#endif
@@ -153,6 +156,7 @@ {CTL_FS, "fs", NULL, 0, 0555, fs_table}, {CTL_DEBUG, "debug", NULL, 0, 0555, debug_table}, {CTL_DEV, "dev", NULL, 0, 0555, dev_table}, + {CTL_SCHED, "sched", NULL, 0, 0555, sched_table}, {0} };
@@ -278,6 +282,33 @@ {0} }; + +static ctl_table sched_table[] = { + {MAX_SLICE ,"MAX_TIMESLICE" , + &max_timeslice,sizeof (int ),0644 ,NULL , &proc_dointvec}, + {MIN_SLICE ,"MIN_TIMESLICE" , + &min_timeslice,sizeof (int ),0644 ,NULL , &proc_dointvec}, + {CHILD_PENALTY ,"CHILD_FORK_PENALTY" , + &child_fork_penalty,sizeof (int ),0644 ,NULL , &proc_dointvec}, + {PARENT_PENALTY ,"PARENT_FORK_PENALTY" , + &parent_fork_penalty,sizeof (int ),0644 ,NULL , &proc_dointvec}, + {INT_RATIO ,"PRIO_INTERACTIVE_RATIO" , + &prio_interactive_ratio,sizeof (int ),0644 ,NULL , &proc_dointvec}, + {HOG_RATIO ,"PRIO_CPU_HOG_RATIO" , + &prio_cpu_hog_ratio,sizeof (int ),0644 ,NULL , &proc_dointvec}, + {BONUS_RATIO ,"PRIO_BONUS_RATIO" , + &prio_bonus_ratio,sizeof (int ),0644 ,NULL , &proc_dointvec}, + {INT_DELTA ,"INTERACTIVE_DELTA" , + &interactive_delta,sizeof (int ),0644 ,NULL , &proc_dointvec}, + {EWEIGHT ,"EXIT_WEIGHT" , + &exit_weight,sizeof (int ),0644 ,NULL , &proc_dointvec}, + {MAX_SLEEP ,"MAX_SLEEP_AVG" , + &max_sleep_avg,sizeof (int ),0644 ,NULL , &proc_dointvec}, + {STARVE_LIM ,"INTERACTIVE_DELTA" , + &starvation_limit,sizeof (int ),0644 ,NULL , &proc_dointvec}, + {0 } +}; +static ctl_table proc_table[] = { {0 } };