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authorMel Gorman <mel@csn.ul.ie>2010-10-27 15:34:42 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-10-27 18:03:17 -0700
commitdb9e5679d6aecb17253f41bd06d98194800f9c01 (patch)
tree57a5c1ed67b40b9b736e1f80c15931bcda78b90e /Documentation
parent7af37bec41b19fcb9de2b42f355a39149641170e (diff)
delay-accounting: reimplement -c for getdelays.c to report information on a target command
Task delay-accounting was identified as one means of determining how long a process spends in congestion_wait() without adding new statistics. For example, if the workload should not be doing IO, delay-accounting could reveal how long it was spending in unexpected IO or delays. Unfortunately, on closer examination it was clear that getdelays does not act as documented. Commit a3baf649 ("per-task-delay-accounting: documentation") added Documentation/accounting/getdelays.c with a -c switch that was documented to fork/exec a child and report statistics on it but for reasons that are unclear to me, commit 9e06d3f9 deleted support for this switch but did not update the documentation. It might be an oversight or it might be because the control flow of the program meant that accounting information would be printed once early in the lifetime of the program making it of limited use. This patch reimplements -c for getdelays.c to act as documented. Unlike the original version, it waits until the command completes before printing any information on it. An example of it being used looks like $ ./getdelays -d -c find /home/mel -name mel print delayacct stats ON /home/mel /home/mel/.notes-wine/drive_c/windows/profiles/mel /home/mel/.wine/drive_c/windows/profiles/mel /home/mel/git-configs/dot.kde/share/apps/konqueror/home/mel PID 5923 CPU count real total virtual total delay total 42779 5051232096 5164722692 564207988 IO count delay total 41727 97804147758 SWAP count delay total 0 0 RECLAIM count delay total 0 0 [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Mel Gorman <mel@csn.ul.ie> Acked-by: Balbir Singh <balbir@in.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/accounting/getdelays.c38
1 files changed, 36 insertions, 2 deletions
diff --git a/Documentation/accounting/getdelays.c b/Documentation/accounting/getdelays.c
index 6e25c2659e0a..a2976a6de033 100644
--- a/Documentation/accounting/getdelays.c
+++ b/Documentation/accounting/getdelays.c
@@ -21,6 +21,7 @@
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
+#include <sys/wait.h>
#include <signal.h>
#include <linux/genetlink.h>
@@ -266,11 +267,13 @@ int main(int argc, char *argv[])
int containerset = 0;
char containerpath[1024];
int cfd = 0;
+ int forking = 0;
+ sigset_t sigset;
struct msgtemplate msg;
- while (1) {
- c = getopt(argc, argv, "qdiw:r:m:t:p:vlC:");
+ while (!forking) {
+ c = getopt(argc, argv, "qdiw:r:m:t:p:vlC:c:");
if (c < 0)
break;
@@ -319,6 +322,28 @@ int main(int argc, char *argv[])
err(1, "Invalid pid\n");
cmd_type = TASKSTATS_CMD_ATTR_PID;
break;
+ case 'c':
+
+ /* Block SIGCHLD for sigwait() later */
+ if (sigemptyset(&sigset) == -1)
+ err(1, "Failed to empty sigset");
+ if (sigaddset(&sigset, SIGCHLD))
+ err(1, "Failed to set sigchld in sigset");
+ sigprocmask(SIG_BLOCK, &sigset, NULL);
+
+ /* fork/exec a child */
+ tid = fork();
+ if (tid < 0)
+ err(1, "Fork failed\n");
+ if (tid == 0)
+ if (execvp(argv[optind - 1],
+ &argv[optind - 1]) < 0)
+ exit(-1);
+
+ /* Set the command type and avoid further processing */
+ cmd_type = TASKSTATS_CMD_ATTR_PID;
+ forking = 1;
+ break;
case 'v':
printf("debug on\n");
dbg = 1;
@@ -370,6 +395,15 @@ int main(int argc, char *argv[])
goto err;
}
+ /*
+ * If we forked a child, wait for it to exit. Cannot use waitpid()
+ * as all the delicious data would be reaped as part of the wait
+ */
+ if (tid && forking) {
+ int sig_received;
+ sigwait(&sigset, &sig_received);
+ }
+
if (tid) {
rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
cmd_type, &tid, sizeof(__u32));