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charset="utf-8" When a sched_ext server is loaded, tasks in CFS are converted to run in sched_ext class. Add support to modify the ext server parameters similar to how the fair server parameters are modified. Re-use common code between ext and fair servers as needed. Signed-off-by: Joel Fernandes --- kernel/sched/debug.c | 160 ++++++++++++++++++++++++++++++++++++------- 1 file changed, 135 insertions(+), 25 deletions(-) diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c index 6866f0a9e88c..de1f14f73077 100644 --- a/kernel/sched/debug.c +++ b/kernel/sched/debug.c @@ -341,14 +341,16 @@ enum dl_param { DL_PERIOD, }; =20 -static unsigned long fair_server_period_max =3D (1UL << 22) * NSEC_PER_USE= C; /* ~4 seconds */ -static unsigned long fair_server_period_min =3D (100) * NSEC_PER_USEC; = /* 100 us */ +static unsigned long dl_server_period_max =3D (1UL << 22) * NSEC_PER_USEC;= /* ~4 seconds */ +static unsigned long dl_server_period_min =3D (100) * NSEC_PER_USEC; /= * 100 us */ =20 -static ssize_t sched_fair_server_write(struct file *filp, const char __use= r *ubuf, - size_t cnt, loff_t *ppos, enum dl_param param) +static ssize_t sched_server_write_common(struct file *filp, const char __u= ser *ubuf, + size_t cnt, loff_t *ppos, enum dl_param param, + void *server) { long cpu =3D (long) ((struct seq_file *) filp->private_data)->private; struct rq *rq =3D cpu_rq(cpu); + struct sched_dl_entity *dl_se =3D (struct sched_dl_entity *)server; bool was_active =3D false; u64 runtime, period; int retval =3D 0; @@ -360,8 +362,8 @@ static ssize_t sched_fair_server_write(struct file *fil= p, const char __user *ubu return err; =20 scoped_guard (rq_lock_irqsave, rq) { - runtime =3D rq->fair_server.dl_runtime; - period =3D rq->fair_server.dl_period; + runtime =3D dl_se->dl_runtime; + period =3D dl_se->dl_period; =20 switch (param) { case DL_RUNTIME: @@ -377,25 +379,30 @@ static ssize_t sched_fair_server_write(struct file *f= ilp, const char __user *ubu } =20 if (runtime > period || - period > fair_server_period_max || - period < fair_server_period_min) { + period > dl_server_period_max || + period < dl_server_period_min) { return -EINVAL; } =20 - if (dl_server_active(&rq->fair_server)) { + if (dl_server_active(dl_se)) { was_active =3D true; update_rq_clock(rq); - dl_server_stop(&rq->fair_server); + dl_server_stop(dl_se); } =20 - retval =3D dl_server_apply_params(&rq->fair_server, runtime, period, 0); + retval =3D dl_server_apply_params(dl_se, runtime, period, 0); =20 - if (!runtime) - printk_deferred("Fair server disabled in CPU %d, system may crash due t= o starvation.\n", - cpu_of(rq)); + if (!runtime) { + if (server =3D=3D &rq->fair_server) + printk_deferred("Fair server disabled on CPU %d, system may crash due = to starvation.\n", + cpu_of(rq)); + else + printk_deferred("Ext server disabled on CPU %d, system may crash due t= o starvation.\n", + cpu_of(rq)); + } =20 if (was_active) - dl_server_start(&rq->fair_server); + dl_server_start(dl_se); =20 if (retval < 0) return retval; @@ -405,36 +412,46 @@ static ssize_t sched_fair_server_write(struct file *f= ilp, const char __user *ubu return cnt; } =20 -static size_t sched_fair_server_show(struct seq_file *m, void *v, enum dl_= param param) + + +static size_t sched_server_show_common(struct seq_file *m, void *v, enum d= l_param param, + void *server) { - unsigned long cpu =3D (unsigned long) m->private; - struct rq *rq =3D cpu_rq(cpu); + struct sched_dl_entity *dl_se =3D (struct sched_dl_entity *)server; u64 value; =20 switch (param) { case DL_RUNTIME: - value =3D rq->fair_server.dl_runtime; + value =3D dl_se->dl_runtime; break; case DL_PERIOD: - value =3D rq->fair_server.dl_period; + value =3D dl_se->dl_period; break; } =20 seq_printf(m, "%llu\n", value); return 0; - } =20 + + static ssize_t sched_fair_server_runtime_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos) { - return sched_fair_server_write(filp, ubuf, cnt, ppos, DL_RUNTIME); + long cpu =3D (long) ((struct seq_file *) filp->private_data)->private; + struct rq *rq =3D cpu_rq(cpu); + + return sched_server_write_common(filp, ubuf, cnt, ppos, DL_RUNTIME, + &rq->fair_server); } =20 static int sched_fair_server_runtime_show(struct seq_file *m, void *v) { - return sched_fair_server_show(m, v, DL_RUNTIME); + unsigned long cpu =3D (unsigned long) m->private; + struct rq *rq =3D cpu_rq(cpu); + + return sched_server_show_common(m, v, DL_RUNTIME, &rq->fair_server); } =20 static int sched_fair_server_runtime_open(struct inode *inode, struct file= *filp) @@ -450,16 +467,55 @@ static const struct file_operations fair_server_runti= me_fops =3D { .release =3D single_release, }; =20 +static ssize_t +sched_ext_server_runtime_write(struct file *filp, const char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + long cpu =3D (long) ((struct seq_file *) filp->private_data)->private; + struct rq *rq =3D cpu_rq(cpu); + + return sched_server_write_common(filp, ubuf, cnt, ppos, DL_RUNTIME, + &rq->ext_server); +} + +static int sched_ext_server_runtime_show(struct seq_file *m, void *v) +{ + unsigned long cpu =3D (unsigned long) m->private; + struct rq *rq =3D cpu_rq(cpu); + + return sched_server_show_common(m, v, DL_RUNTIME, &rq->ext_server); +} + +static int sched_ext_server_runtime_open(struct inode *inode, struct file = *filp) +{ + return single_open(filp, sched_ext_server_runtime_show, inode->i_private); +} + +static const struct file_operations ext_server_runtime_fops =3D { + .open =3D sched_ext_server_runtime_open, + .write =3D sched_ext_server_runtime_write, + .read =3D seq_read, + .llseek =3D seq_lseek, + .release =3D single_release, +}; + static ssize_t sched_fair_server_period_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos) { - return sched_fair_server_write(filp, ubuf, cnt, ppos, DL_PERIOD); + long cpu =3D (long) ((struct seq_file *) filp->private_data)->private; + struct rq *rq =3D cpu_rq(cpu); + + return sched_server_write_common(filp, ubuf, cnt, ppos, DL_PERIOD, + &rq->fair_server); } =20 static int sched_fair_server_period_show(struct seq_file *m, void *v) { - return sched_fair_server_show(m, v, DL_PERIOD); + unsigned long cpu =3D (unsigned long) m->private; + struct rq *rq =3D cpu_rq(cpu); + + return sched_server_show_common(m, v, DL_PERIOD, &rq->fair_server); } =20 static int sched_fair_server_period_open(struct inode *inode, struct file = *filp) @@ -475,6 +531,38 @@ static const struct file_operations fair_server_period= _fops =3D { .release =3D single_release, }; =20 +static ssize_t +sched_ext_server_period_write(struct file *filp, const char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + long cpu =3D (long) ((struct seq_file *) filp->private_data)->private; + struct rq *rq =3D cpu_rq(cpu); + + return sched_server_write_common(filp, ubuf, cnt, ppos, DL_PERIOD, + &rq->ext_server); +} + +static int sched_ext_server_period_show(struct seq_file *m, void *v) +{ + unsigned long cpu =3D (unsigned long) m->private; + struct rq *rq =3D cpu_rq(cpu); + + return sched_server_show_common(m, v, DL_PERIOD, &rq->ext_server); +} + +static int sched_ext_server_period_open(struct inode *inode, struct file *= filp) +{ + return single_open(filp, sched_ext_server_period_show, inode->i_private); +} + +static const struct file_operations ext_server_period_fops =3D { + .open =3D sched_ext_server_period_open, + .write =3D sched_ext_server_period_write, + .read =3D seq_read, + .llseek =3D seq_lseek, + .release =3D single_release, +}; + static struct dentry *debugfs_sched; =20 static void debugfs_fair_server_init(void) @@ -498,6 +586,27 @@ static void debugfs_fair_server_init(void) } } =20 +static void debugfs_ext_server_init(void) +{ + struct dentry *d_ext; + unsigned long cpu; + + d_ext =3D debugfs_create_dir("ext_server", debugfs_sched); + if (!d_ext) + return; + + for_each_possible_cpu(cpu) { + struct dentry *d_cpu; + char buf[32]; + + snprintf(buf, sizeof(buf), "cpu%lu", cpu); + d_cpu =3D debugfs_create_dir(buf, d_ext); + + debugfs_create_file("runtime", 0644, d_cpu, (void *) cpu, &ext_server_ru= ntime_fops); + debugfs_create_file("period", 0644, d_cpu, (void *) cpu, &ext_server_per= iod_fops); + } +} + static __init int sched_init_debug(void) { struct dentry __maybe_unused *numa; @@ -538,6 +647,7 @@ static __init int sched_init_debug(void) debugfs_create_file("debug", 0444, debugfs_sched, NULL, &sched_debug_fops= ); =20 debugfs_fair_server_init(); + debugfs_ext_server_init(); =20 return 0; } --=20 2.34.1