[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>

1 files changed, 72 insertions, 0 deletions

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));
+}
+