From 24e377a83220ef05c9b5bec7e01d65eed6609aa6 Mon Sep 17 00:00:00 2001 From: Srivatsa Vaddagiri Date: Mon, 15 Oct 2007 17:00:09 +0200 Subject: sched: add fair-user scheduler Enable user-id based fair group scheduling. This is useful for anyone who wants to test the group scheduler w/o having to enable CONFIG_CGROUPS. A separate scheduling group (i.e struct task_grp) is automatically created for every new user added to the system. Upon uid change for a task, it is made to move to the corresponding scheduling group. A /proc tunable (/proc/root_user_share) is also provided to tune root user's quota of cpu bandwidth. Signed-off-by: Srivatsa Vaddagiri Signed-off-by: Dhaval Giani Signed-off-by: Ingo Molnar Signed-off-by: Peter Zijlstra Reviewed-by: Thomas Gleixner --- kernel/sched.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'kernel/sched.c') diff --git a/kernel/sched.c b/kernel/sched.c index e10c403..f33608e 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -200,7 +200,12 @@ struct task_grp init_task_grp = { .cfs_rq = init_cfs_rq_p, }; +#ifdef CONFIG_FAIR_USER_SCHED +#define INIT_TASK_GRP_LOAD 2*NICE_0_LOAD +#else #define INIT_TASK_GRP_LOAD NICE_0_LOAD +#endif + static int init_task_grp_load = INIT_TASK_GRP_LOAD; /* return group to which a task belongs */ @@ -208,7 +213,11 @@ static inline struct task_grp *task_grp(struct task_struct *p) { struct task_grp *tg; +#ifdef CONFIG_FAIR_USER_SCHED + tg = p->user->tg; +#else tg = &init_task_grp; +#endif return tg; } -- cgit v1.1