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Date: Tue, 21 Jul 2009 10:32:04 +0530
From: Nikanth Karthikesan <knikanth@...e.de>
To: linux-kernel@...r.kernel.org
Cc: balbir@...ux.vnet.ibm.com
Subject: [PATCH 3/3] taskstats-fork: Add Documentation for taskstats fork notification
Add documentation for the new taskstats command to receive notification of new
processes being spawned.
Signed-off-by: Nikanth Karthikesan <knikanth@...e.de>
---
diff --git a/Documentation/accounting/getdelays.c b/Documentation/accounting/getdelays.c
index aa73e72..fcbec43 100644
--- a/Documentation/accounting/getdelays.c
+++ b/Documentation/accounting/getdelays.c
@@ -69,12 +69,13 @@ struct msgtemplate {
char buf[MAX_MSG_SIZE];
};
-char cpumask[100+6*MAX_CPUS];
+char fork_cpumask[100+6*MAX_CPUS];
+char exit_cpumask[100+6*MAX_CPUS];
static void usage(void)
{
fprintf(stderr, "getdelays [-dilv] [-w logfile] [-r bufsize] "
- "[-m cpumask] [-t tgid] [-p pid]\n");
+ "[-e cpumask] [-f cpumask] [-t tgid] [-p pid]\n");
fprintf(stderr, " -d: print delayacct stats\n");
fprintf(stderr, " -i: print IO accounting (works only with -p)\n");
fprintf(stderr, " -l: listen forever\n");
@@ -260,7 +261,8 @@ int main(int argc, char *argv[])
int fd = 0;
int count = 0;
int write_file = 0;
- int maskset = 0;
+ int fork_maskset = 0;
+ int exit_maskset = 0;
char *logfile = NULL;
int loop = 0;
int containerset = 0;
@@ -270,7 +272,7 @@ int main(int argc, char *argv[])
struct msgtemplate msg;
while (1) {
- c = getopt(argc, argv, "qdiw:r:m:t:p:vlC:");
+ c = getopt(argc, argv, "qdiw:r:e:f:t:p:vlC:");
if (c < 0)
break;
@@ -302,10 +304,15 @@ int main(int argc, char *argv[])
if (rcvbufsz < 0)
err(1, "Invalid rcv buf size\n");
break;
- case 'm':
- strncpy(cpumask, optarg, sizeof(cpumask));
- maskset = 1;
- printf("cpumask %s maskset %d\n", cpumask, maskset);
+ case 'f':
+ strncpy(fork_cpumask, optarg, sizeof(fork_cpumask));
+ fork_maskset = 1;
+ printf("fork_cpumask %s maskset %d\n", fork_cpumask, fork_maskset);
+ break;
+ case 'e':
+ strncpy(exit_cpumask, optarg, sizeof(exit_cpumask));
+ exit_maskset = 1;
+ printf("exit_cpumask %s maskset %d\n", exit_cpumask, exit_maskset);
break;
case 't':
tid = atoi(optarg);
@@ -354,10 +361,21 @@ int main(int argc, char *argv[])
}
PRINTF("family id %d\n", id);
- if (maskset) {
+ if (fork_maskset) {
+ rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
+ TASKSTATS_CMD_ATTR_REGISTER_FORK_CPUMASK,
+ &fork_cpumask, strlen(fork_cpumask) + 1);
+ PRINTF("Sent register fork cpumask, retval %d\n", rc);
+ if (rc < 0) {
+ fprintf(stderr, "error sending register fork cpumask\n");
+ goto err;
+ }
+ }
+
+ if (exit_maskset) {
rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
TASKSTATS_CMD_ATTR_REGISTER_CPUMASK,
- &cpumask, strlen(cpumask) + 1);
+ &exit_cpumask, strlen(exit_cpumask) + 1);
PRINTF("Sent register cpumask, retval %d\n", rc);
if (rc < 0) {
fprintf(stderr, "error sending register cpumask\n");
@@ -393,7 +411,7 @@ int main(int argc, char *argv[])
goto err;
}
}
- if (!maskset && !tid && !containerset) {
+ if (!fork_maskset && !exit_maskset && !tid && !containerset) {
usage();
goto err;
}
@@ -429,6 +447,9 @@ int main(int argc, char *argv[])
while (len < rep_len) {
len += NLA_ALIGN(na->nla_len);
switch (na->nla_type) {
+ case TASKSTATS_TYPE_PID_TGID:
+ printf("New Task: \n");
+ /* Fall through */
case TASKSTATS_TYPE_AGGR_TGID:
/* Fall through */
case TASKSTATS_TYPE_AGGR_PID:
@@ -488,10 +509,18 @@ int main(int argc, char *argv[])
}
} while (loop);
done:
- if (maskset) {
+ if (fork_maskset) {
+ rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
+ TASKSTATS_CMD_ATTR_DEREGISTER_FORK_CPUMASK,
+ &fork_cpumask, strlen(fork_cpumask) + 1);
+ printf("Sent deregister fork mask, retval %d\n", rc);
+ if (rc < 0)
+ err(rc, "error sending deregister fork cpumask\n");
+ }
+ if (exit_maskset) {
rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK,
- &cpumask, strlen(cpumask) + 1);
+ &exit_cpumask, strlen(exit_cpumask) + 1);
printf("Sent deregister mask, retval %d\n", rc);
if (rc < 0)
err(rc, "error sending deregister cpumask\n");
--
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