[PATCH] csa: basic accounting over taskstats

Add some basic accounting fields to the taskstats struct, add a new
kernel/tsacct.c to handle basic accounting data handling upon exit.  A handle
is added to taskstats.c to invoke the basic accounting data handling.

Signed-off-by: Jay Lan <jlan@sgi.com>
Cc: Shailabh Nagar <nagar@watson.ibm.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Jes Sorensen <jes@sgi.com>
Cc: Chris Sturtivant <csturtiv@sgi.com>
Cc: Tony Ernst <tee@sgi.com>
Cc: Guillaume Thouvenin <guillaume.thouvenin@bull.net>
Cc: "Michal Piotrowski" <michal.k.k.piotrowski@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

5 files changed, 120 insertions, 6 deletions

diff --git a/include/linux/taskstats.h b/include/linux/taskstats.h
index f1cb6cddd19d..af93a63a5092 100644
--- a/include/linux/taskstats.h
+++ b/include/linux/taskstats.h
@@ -2,6 +2,7 @@
  *
  * Copyright (C) Shailabh Nagar, IBM Corp. 2006
  *           (C) Balbir Singh,   IBM Corp. 2006
+ *           (C) Jay Lan,        SGI, 2006
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of version 2.1 of the GNU Lesser General Public License
@@ -29,16 +30,18 @@
  *      c) add new fields after version comment; maintain 64-bit alignment
  */
 
-#define TASKSTATS_VERSION       1
+
+#define TASKSTATS_VERSION       2
+#define TS_COMM_LEN             16      /* should sync up with TASK_COMM_LEN
+                                         * in linux/sched.h */
 
 struct taskstats {
 
         /* Version 1 */
         __u16   version;
-        __u16   padding[3];     /* Userspace should not interpret the padding
-                                 * field which can be replaced by useful
-                                 * fields if struct taskstats is extended.
-                                 */
+        __u32   ac_exitcode;    /* Exit status */
+        __u8    ac_flag;                /* Record flags */
+        __u8    ac_nice;                /* task_nice */
 
         /* Delay accounting fields start
          *
@@ -88,6 +91,22 @@ struct taskstats {
         __u64   cpu_run_virtual_total;
         /* Delay accounting fields end */
         /* version 1 ends here */
+
+        /* Basic Accounting Fields start */
+        char    ac_comm[TS_COMM_LEN];   /* Command name */
+        __u8    ac_sched;               /* Scheduling discipline */
+        __u8    ac_pad[3];
+        __u32   ac_uid;                 /* User ID */
+        __u32   ac_gid;                 /* Group ID */
+        __u32   ac_pid;                 /* Process ID */
+        __u32   ac_ppid;                /* Parent process ID */
+        __u32   ac_btime;               /* Begin time [sec since 1970] */
+        __u64   ac_etime;               /* Elapsed time [usec] */
+        __u64   ac_utime;               /* User CPU time [usec] */
+        __u64   ac_stime;               /* SYstem CPU time [usec] */
+        __u64   ac_minflt;              /* Minor Page Fault */
+        __u64   ac_majflt;              /* Major Page Fault */
+        /* Basic Accounting Fields end */
 };
 
 
diff --git a/include/linux/tsacct_kern.h b/include/linux/tsacct_kern.h
new file mode 100644
index 000000000000..7e8196a02118
--- /dev/null
+++ b/include/linux/tsacct_kern.h
@@ -0,0 +1,19 @@
+/*
+ * tsacct_kern.h - kernel header for system accounting over taskstats interface
+ *
+ * Copyright (C) Jay Lan        SGI
+ */
+
+#ifndef _LINUX_TSACCT_KERN_H
+#define _LINUX_TSACCT_KERN_H
+
+#include <linux/taskstats.h>
+
+#ifdef CONFIG_TASKSTATS
+extern void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk);
+#else
+static inline void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)
+{}
+#endif /* CONFIG_TASKSTATS */
+
+#endif
diff --git a/kernel/Makefile b/kernel/Makefile
index e210e8cf7237..aacaafb28b9d 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -49,7 +49,7 @@ obj-$(CONFIG_SECCOMP) += seccomp.o
 obj-$(CONFIG_RCU_TORTURE_TEST) += rcutorture.o
 obj-$(CONFIG_RELAY) += relay.o
 obj-$(CONFIG_TASK_DELAY_ACCT) += delayacct.o
-obj-$(CONFIG_TASKSTATS) += taskstats.o
+obj-$(CONFIG_TASKSTATS) += taskstats.o tsacct.o
 
 ifneq ($(CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER),y)
 # According to Alan Modra <alan@linuxcare.com.au>, the -fno-omit-frame-pointer is
diff --git a/kernel/taskstats.c b/kernel/taskstats.c
index c451af2ddb50..6c38dce88e8c 100644
--- a/kernel/taskstats.c
+++ b/kernel/taskstats.c
@@ -18,6 +18,7 @@
 
 #include <linux/kernel.h>
 #include <linux/taskstats_kern.h>
+#include <linux/tsacct_kern.h>
 #include <linux/delayacct.h>
 #include <linux/cpumask.h>
 #include <linux/percpu.h>
@@ -198,7 +199,10 @@ static int fill_pid(pid_t pid, struct task_struct *pidtsk,
          */
 
         delayacct_add_tsk(stats, tsk);
+
+        /* fill in basic acct fields */
         stats->version = TASKSTATS_VERSION;
+        bacct_add_tsk(stats, tsk);
 
         /* Define err: label here if needed */
         put_task_struct(tsk);
diff --git a/kernel/tsacct.c b/kernel/tsacct.c
new file mode 100644
index 000000000000..899067950a88
--- /dev/null
+++ b/kernel/tsacct.c
@@ -0,0 +1,72 @@
+/*
+ * tsacct.c - System accounting over taskstats interface
+ *
+ * Copyright (C) Jay Lan,       <jlan@sgi.com>
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/tsacct_kern.h>
+#include <linux/acct.h>
+
+
+#define USEC_PER_TICK   (USEC_PER_SEC/HZ)
+/*
+ * fill in basic accounting fields
+ */
+void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)
+{
+        struct timespec uptime, ts;
+        s64 ac_etime;
+
+        BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN);
+
+        /* calculate task elapsed time in timespec */
+        do_posix_clock_monotonic_gettime(&uptime);
+        ts = timespec_sub(uptime, current->group_leader->start_time);
+        /* rebase elapsed time to usec */
+        ac_etime = timespec_to_ns(&ts);
+        do_div(ac_etime, NSEC_PER_USEC);
+        stats->ac_etime = ac_etime;
+        stats->ac_btime = xtime.tv_sec - ts.tv_sec;
+        if (thread_group_leader(tsk)) {
+                stats->ac_exitcode = tsk->exit_code;
+                if (tsk->flags & PF_FORKNOEXEC)
+                        stats->ac_flag |= AFORK;
+        }
+        if (tsk->flags & PF_SUPERPRIV)
+                stats->ac_flag |= ASU;
+        if (tsk->flags & PF_DUMPCORE)
+                stats->ac_flag |= ACORE;
+        if (tsk->flags & PF_SIGNALED)
+                stats->ac_flag |= AXSIG;
+        stats->ac_nice   = task_nice(tsk);
+        stats->ac_sched  = tsk->policy;
+        stats->ac_uid    = tsk->uid;
+        stats->ac_gid    = tsk->gid;
+        stats->ac_pid    = tsk->pid;
+        stats->ac_ppid   = (tsk->parent) ? tsk->parent->pid : 0;
+        stats->ac_utime  = cputime_to_msecs(tsk->utime) * USEC_PER_MSEC;
+        stats->ac_stime  = cputime_to_msecs(tsk->stime) * USEC_PER_MSEC;
+        stats->ac_minflt = tsk->min_flt;
+        stats->ac_majflt = tsk->maj_flt;
+        /* Each process gets a minimum of one usec cpu time */
+        if ((stats->ac_utime == 0) && (stats->ac_stime == 0)) {
+                stats->ac_stime = 1;
+        }
+
+        strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm));
+}
+