accounting: account for user time when updating memory integrals

Adapt acct_update_integrals() to include user time when calculating the time
difference.  The units of acct_rss_mem1 and acct_vm_mem1 are also changed from
pages-jiffies to pages-usecs to avoid calling jiffies_to_usecs() in
xacct_add_tsk() which might overflow.

Signed-off-by: Jonathan Lim <jlim@sgi.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 354ef47..af780f2 100644 (file)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1257,7 +1257,7 @@ struct task_struct {
 #if defined(CONFIG_TASK_XACCT)
        u64 acct_rss_mem1;      /* accumulated rss usage */
        u64 acct_vm_mem1;       /* accumulated virtual memory usage */
-       cputime_t acct_stimexpd;/* stime since last update */
+       cputime_t acct_timexpd; /* stime + utime since last update */
 #endif
 #ifdef CONFIG_CPUSETS
        nodemask_t mems_allowed;

diff --git a/kernel/sched.c b/kernel/sched.c
index 6acf749..0047bd9 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4046,6 +4046,8 @@ void account_user_time(struct task_struct *p, cputime_t cputime)
                cpustat->nice = cputime64_add(cpustat->nice, tmp);
        else
                cpustat->user = cputime64_add(cpustat->user, tmp);
+       /* Account for user time used */
+       acct_update_integrals(p);
 }
 
 /*

diff --git a/kernel/tsacct.c b/kernel/tsacct.c
index 4ab1b58..1da6990 100644 (file)
--- a/kernel/tsacct.c
+++ b/kernel/tsacct.c
@@ -84,9 +84,9 @@ void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
 {
        struct mm_struct *mm;
 
-       /* convert pages-jiffies to Mbyte-usec */
-       stats->coremem = jiffies_to_usecs(p->acct_rss_mem1) * PAGE_SIZE / MB;
-       stats->virtmem = jiffies_to_usecs(p->acct_vm_mem1) * PAGE_SIZE / MB;
+       /* convert pages-usec to Mbyte-usec */
+       stats->coremem = p->acct_rss_mem1 * PAGE_SIZE / MB;
+       stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE / MB;
        mm = get_task_mm(p);
        if (mm) {
                /* adjust to KB unit */
@@ -118,12 +118,19 @@ void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
 void acct_update_integrals(struct task_struct *tsk)
 {
        if (likely(tsk->mm)) {
-               long delta = cputime_to_jiffies(
-                       cputime_sub(tsk->stime, tsk->acct_stimexpd));
+               cputime_t time, dtime;
+               struct timeval value;
+               u64 delta;
+
+               time = tsk->stime + tsk->utime;
+               dtime = cputime_sub(time, tsk->acct_timexpd);
+               jiffies_to_timeval(cputime_to_jiffies(dtime), &value);
+               delta = value.tv_sec;
+               delta = delta * USEC_PER_SEC + value.tv_usec;
 
                if (delta == 0)
                        return;
-               tsk->acct_stimexpd = tsk->stime;
+               tsk->acct_timexpd = time;
                tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm);
                tsk->acct_vm_mem1 += delta * tsk->mm->total_vm;
        }
@@ -135,7 +142,7 @@ void acct_update_integrals(struct task_struct *tsk)
  */
 void acct_clear_integrals(struct task_struct *tsk)
 {
-       tsk->acct_stimexpd = 0;
+       tsk->acct_timexpd = 0;
        tsk->acct_rss_mem1 = 0;
        tsk->acct_vm_mem1 = 0;
 }