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chrt: add support for SCHED_BATCH

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Signed-off-by: Povilas Kanapickas <povilas@radix.lt>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Povilas Kanapickas 2018-01-13 23:26:39 +02:00 committed by Denys Vlasenko
parent 2b9a45b9e8
commit 1616fb8aca
1 changed files with 11 additions and 5 deletions
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16
util-linux/chrt.c
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@ -17,13 +17,14 @@
//kbuild:lib-$(CONFIG_CHRT) += chrt.o //kbuild:lib-$(CONFIG_CHRT) += chrt.o
//usage:#define chrt_trivial_usage //usage:#define chrt_trivial_usage
//usage: "[-prfom] [PRIO] [PID | PROG ARGS]" //usage: "[-prfomb] [PRIO] [PID | PROG ARGS]"
//usage:#define chrt_full_usage "\n\n" //usage:#define chrt_full_usage "\n\n"
//usage: "Change scheduling priority and class for a process\n" //usage: "Change scheduling priority and class for a process\n"
//usage: "\n -p Operate on PID" //usage: "\n -p Operate on PID"
//usage: "\n -r Set SCHED_RR class" //usage: "\n -r Set SCHED_RR class"
//usage: "\n -f Set SCHED_FIFO class" //usage: "\n -f Set SCHED_FIFO class"
//usage: "\n -o Set SCHED_OTHER class" //usage: "\n -o Set SCHED_OTHER class"
//usage: "\n -b Set SCHED_BATCH class"
//usage: "\n -m Show min/max priorities" //usage: "\n -m Show min/max priorities"
//usage: //usage:
//usage:#define chrt_example_usage //usage:#define chrt_example_usage
@ -40,11 +41,11 @@ static const struct {
} policies[] = { } policies[] = {
{SCHED_OTHER, "SCHED_OTHER"}, {SCHED_OTHER, "SCHED_OTHER"},
{SCHED_FIFO, "SCHED_FIFO"}, {SCHED_FIFO, "SCHED_FIFO"},
{SCHED_RR, "SCHED_RR"} {SCHED_RR, "SCHED_RR"},
{SCHED_BATCH, "SCHED_BATCH"}
}; };
//TODO: add //TODO: add
// -b, SCHED_BATCH
// -i, SCHED_IDLE // -i, SCHED_IDLE
static void show_min_max(int pol) static void show_min_max(int pol)
@ -64,6 +65,7 @@ static void show_min_max(int pol)
#define OPT_r (1<<2) #define OPT_r (1<<2)
#define OPT_f (1<<3) #define OPT_f (1<<3)
#define OPT_o (1<<4) #define OPT_o (1<<4)
#define OPT_b (1<<5)
int chrt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int chrt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int chrt_main(int argc UNUSED_PARAM, char **argv) int chrt_main(int argc UNUSED_PARAM, char **argv)
@ -77,11 +79,12 @@ int chrt_main(int argc UNUSED_PARAM, char **argv)
int policy = SCHED_RR; int policy = SCHED_RR;
/* only one policy accepted */ /* only one policy accepted */
opt = getopt32(argv, "^+" "mprfo" "\0" "r--fo:f--ro:o--rf"); opt = getopt32(argv, "^+" "mprfob" "\0" "r--fob:f--rob:o--rfb:b--rfo");
if (opt & OPT_m) { /* print min/max and exit */ if (opt & OPT_m) { /* print min/max and exit */
show_min_max(SCHED_FIFO); show_min_max(SCHED_FIFO);
show_min_max(SCHED_RR); show_min_max(SCHED_RR);
show_min_max(SCHED_OTHER); show_min_max(SCHED_OTHER);
show_min_max(SCHED_BATCH);
fflush_stdout_and_exit(EXIT_SUCCESS); fflush_stdout_and_exit(EXIT_SUCCESS);
} }
if (opt & OPT_r) if (opt & OPT_r)
@ -90,6 +93,8 @@ int chrt_main(int argc UNUSED_PARAM, char **argv)
policy = SCHED_FIFO; policy = SCHED_FIFO;
if (opt & OPT_o) if (opt & OPT_o)
policy = SCHED_OTHER; policy = SCHED_OTHER;
if (opt & OPT_b)
policy = SCHED_BATCH;
argv += optind; argv += optind;
if (!argv[0]) if (!argv[0])
@ -136,7 +141,8 @@ int chrt_main(int argc UNUSED_PARAM, char **argv)
[...] SCHED_OTHER or SCHED_BATCH must be assigned static priority 0. [...] SCHED_OTHER or SCHED_BATCH must be assigned static priority 0.
[...] SCHED_FIFO or SCHED_RR can have static priority in 1..99 range. [...] SCHED_FIFO or SCHED_RR can have static priority in 1..99 range.
*/ */
sp.sched_priority = xstrtou_range(priority, 0, policy != SCHED_OTHER ? 1 : 0, 99); sp.sched_priority = xstrtou_range(priority, 0,
(policy != SCHED_OTHER && policy != SCHED_BATCH) ? 1 : 0, 99);
if (sched_setscheduler(pid, policy, &sp) < 0) if (sched_setscheduler(pid, policy, &sp) < 0)
bb_perror_msg_and_die("can't %cet pid %d's policy", 's', (int)pid); bb_perror_msg_and_die("can't %cet pid %d's policy", 's', (int)pid);