make getdelays cgroupstats aware

Update the getdelays utility to become cgroupstats aware.  A new -C option has
been added.  It takes in a control group path and prints out a summary of the
states of tasks in the control group

Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 42 insertions, 1 deletions

diff --git a/Documentation/accounting/getdelays.c b/Documentation/accounting/getdelays.c
index ab82b7f53312..d6cb1a86fd61 100644
--- a/Documentation/accounting/getdelays.c
+++ b/Documentation/accounting/getdelays.c
@@ -25,6 +25,7 @@
 
 #include <linux/genetlink.h>
 #include <linux/taskstats.h>
+#include <linux/cgroupstats.h>
 
 /*
  * Generic macros for dealing with netlink sockets. Might be duplicated
@@ -78,6 +79,7 @@ static void usage(void)
         fprintf(stderr, "  -i: print IO accounting (works only with -p)\n");
         fprintf(stderr, "  -l: listen forever\n");
         fprintf(stderr, "  -v: debug on\n");
+        fprintf(stderr, "  -C: container path\n");
 }
 
 /*
@@ -212,6 +214,14 @@ void task_context_switch_counts(struct taskstats *t)
                t->nvcsw, t->nivcsw);
 }
 
+void print_cgroupstats(struct cgroupstats *c)
+{
+        printf("sleeping %llu, blocked %llu, running %llu, stopped %llu, "
+                "uninterruptible %llu\n", c->nr_sleeping, c->nr_io_wait,
+                c->nr_running, c->nr_stopped, c->nr_uninterruptible);
+}
+
+
 void print_ioacct(struct taskstats *t)
 {
         printf("%s: read=%llu, write=%llu, cancelled_write=%llu\n",
@@ -239,11 +249,14 @@ int main(int argc, char *argv[])
         int maskset = 0;
         char *logfile = NULL;
         int loop = 0;
+        int containerset = 0;
+        char containerpath[1024];
+        int cfd = 0;
 
         struct msgtemplate msg;
 
         while (1) {
-                c = getopt(argc, argv, "qdiw:r:m:t:p:vl");
+                c = getopt(argc, argv, "qdiw:r:m:t:p:vlC:");
                 if (c < 0)
                         break;
 
@@ -260,6 +273,10 @@ int main(int argc, char *argv[])
                         printf("printing task/process context switch rates\n");
                         print_task_context_switch_counts = 1;
                         break;
+                case 'C':
+                        containerset = 1;
+                        strncpy(containerpath, optarg, strlen(optarg) + 1);
+                        break;
                 case 'w':
                         logfile = strdup(optarg);
                         printf("write to file %s\n", logfile);
@@ -334,6 +351,11 @@ int main(int argc, char *argv[])
                 }
         }
 
+        if (tid && containerset) {
+                fprintf(stderr, "Select either -t or -C, not both\n");
+                goto err;
+        }
+
         if (tid) {
                 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
                               cmd_type, &tid, sizeof(__u32));
@@ -344,6 +366,20 @@ int main(int argc, char *argv[])
                 }
         }
 
+        if (containerset) {
+                cfd = open(containerpath, O_RDONLY);
+                if (cfd < 0) {
+                        perror("error opening container file");
+                        goto err;
+                }
+                rc = send_cmd(nl_sd, id, mypid, CGROUPSTATS_CMD_GET,
+                              CGROUPSTATS_CMD_ATTR_FD, &cfd, sizeof(__u32));
+                if (rc < 0) {
+                        perror("error sending cgroupstats command");
+                        goto err;
+                }
+        }
+
         do {
                 int i;
 
@@ -422,6 +458,9 @@ int main(int argc, char *argv[])
                                 }
                                 break;
 
+                        case CGROUPSTATS_TYPE_CGROUP_STATS:
+                                print_cgroupstats(NLA_DATA(na));
+                                break;
                         default:
                                 fprintf(stderr, "Unknown nla_type %d\n",
                                         na->nla_type);
@@ -443,5 +482,7 @@ err:
         close(nl_sd);
         if (fd)
                 close(fd);
+        if (cfd)
+                close(cfd);
         return 0;
 }