[git commit] chrt: add support for SCHED_IDLE

Denys Vlasenko vda.linux at googlemail.com
Tue Jan 23 15:04:48 UTC 2018


commit: https://git.busybox.net/busybox/commit/?id=0f6e4350b3c36b3b4533d0ea910481e28d5f81ab
branch: https://git.busybox.net/busybox/commit/?id=refs/heads/master

Signed-off-by: Povilas Kanapickas <povilas at radix.lt>
Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
 util-linux/chrt.c | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/util-linux/chrt.c b/util-linux/chrt.c
index e7abd4f..bbd6e2d 100644
--- a/util-linux/chrt.c
+++ b/util-linux/chrt.c
@@ -17,7 +17,7 @@
 //kbuild:lib-$(CONFIG_CHRT) += chrt.o
 
 //usage:#define chrt_trivial_usage
-//usage:       "[-prfomb] [PRIO] [PID | PROG ARGS]"
+//usage:       "[-prfombi] [PRIO] [PID | PROG ARGS]"
 //usage:#define chrt_full_usage "\n\n"
 //usage:       "Change scheduling priority and class for a process\n"
 //usage:     "\n	-p	Operate on PID"
@@ -25,6 +25,7 @@
 //usage:     "\n	-f	Set SCHED_FIFO class"
 //usage:     "\n	-o	Set SCHED_OTHER class"
 //usage:     "\n	-b	Set SCHED_BATCH class"
+//usage:     "\n	-i	Set SCHED_IDLE class"
 //usage:     "\n	-m	Show min/max priorities"
 //usage:
 //usage:#define chrt_example_usage
@@ -42,12 +43,11 @@ static const struct {
 	{SCHED_OTHER, "SCHED_OTHER"},
 	{SCHED_FIFO, "SCHED_FIFO"},
 	{SCHED_RR, "SCHED_RR"},
-	{SCHED_BATCH, "SCHED_BATCH"}
+	{SCHED_BATCH, "SCHED_BATCH"},
+	{0 /* unused */, ""},
+	{SCHED_IDLE, "SCHED_IDLE"}
 };
 
-//TODO: add
-// -i, SCHED_IDLE
-
 static void show_min_max(int pol)
 {
 	const char *fmt = "%s min/max priority\t: %u/%u\n";
@@ -66,6 +66,7 @@ static void show_min_max(int pol)
 #define OPT_f (1<<3)
 #define OPT_o (1<<4)
 #define OPT_b (1<<5)
+#define OPT_i (1<<6)
 
 int chrt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int chrt_main(int argc UNUSED_PARAM, char **argv)
@@ -79,12 +80,13 @@ int chrt_main(int argc UNUSED_PARAM, char **argv)
 	int policy = SCHED_RR;
 
 	/* only one policy accepted */
-	opt = getopt32(argv, "^+" "mprfob" "\0" "r--fob:f--rob:o--rfb:b--rfo");
+	opt = getopt32(argv, "^+" "mprfobi" "\0" "r--fobi:f--robi:o--rfbi:b--rfoi:i--rfob");
 	if (opt & OPT_m) { /* print min/max and exit */
 		show_min_max(SCHED_FIFO);
 		show_min_max(SCHED_RR);
 		show_min_max(SCHED_OTHER);
 		show_min_max(SCHED_BATCH);
+		show_min_max(SCHED_IDLE);
 		fflush_stdout_and_exit(EXIT_SUCCESS);
 	}
 	if (opt & OPT_r)
@@ -95,6 +97,8 @@ int chrt_main(int argc UNUSED_PARAM, char **argv)
 		policy = SCHED_OTHER;
 	if (opt & OPT_b)
 		policy = SCHED_BATCH;
+	if (opt & OPT_i)
+		policy = SCHED_IDLE;
 
 	argv += optind;
 	if (!argv[0])
@@ -138,11 +142,12 @@ int chrt_main(int argc UNUSED_PARAM, char **argv)
 
 	/* from the manpage of sched_getscheduler:
 	[...] sched_priority can have a value in the range 0 to 99.
-	[...] SCHED_OTHER or SCHED_BATCH must be assigned static priority 0.
+	[...] SCHED_OTHER, SCHED_BATCH or SCHED_IDLE must be assigned static
+		  priority 0.
 	[...] SCHED_FIFO or SCHED_RR can have static priority in 1..99 range.
 	*/
 	sp.sched_priority = xstrtou_range(priority, 0,
-			(policy != SCHED_OTHER && policy != SCHED_BATCH) ? 1 : 0, 99);
+			(policy != SCHED_OTHER && policy != SCHED_BATCH && policy != SCHED_IDLE) ? 1 : 0, 99);
 
 	if (sched_setscheduler(pid, policy, &sp) < 0)
 		bb_perror_msg_and_die("can't %cet pid %d's policy", 's', (int)pid);


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