Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...

[linux-flexiantxendom0-3.2.10.git] / kernel / tsacct.c

diff --git a/kernel/tsacct.c b/kernel/tsacct.c
index 8ebcd85..23b4d78 100644 (file)
--- a/kernel/tsacct.c
+++ b/kernel/tsacct.c
@@ -21,12 +21,14 @@
 #include <linux/tsacct_kern.h>
 #include <linux/acct.h>
 #include <linux/jiffies.h>
+#include <linux/mm.h>
 
 /*
  * fill in basic accounting fields
  */
 void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)
 {
+       const struct cred *tcred;
        struct timespec uptime, ts;
        u64 ac_etime;
 
@@ -53,19 +55,18 @@ void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)
                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;
        rcu_read_lock();
+       tcred = __task_cred(tsk);
+       stats->ac_uid    = tcred->uid;
+       stats->ac_gid    = tcred->gid;
        stats->ac_ppid   = pid_alive(tsk) ?
                                rcu_dereference(tsk->real_parent)->tgid : 0;
        rcu_read_unlock();
-       stats->ac_utime  = cputime_to_msecs(tsk->utime) * USEC_PER_MSEC;
-       stats->ac_stime  = cputime_to_msecs(tsk->stime) * USEC_PER_MSEC;
-       stats->ac_utimescaled =
-               cputime_to_msecs(tsk->utimescaled) * USEC_PER_MSEC;
-       stats->ac_stimescaled =
-               cputime_to_msecs(tsk->stimescaled) * USEC_PER_MSEC;
+       stats->ac_utime = cputime_to_usecs(tsk->utime);
+       stats->ac_stime = cputime_to_usecs(tsk->stime);
+       stats->ac_utimescaled = cputime_to_usecs(tsk->utimescaled);
+       stats->ac_stimescaled = cputime_to_usecs(tsk->stimescaled);
        stats->ac_minflt = tsk->min_flt;
        stats->ac_majflt = tsk->maj_flt;
 
@@ -77,6 +78,7 @@ void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)
 
 #define KB 1024
 #define MB (1024*KB)
+#define KB_MASK (~(KB-1))
 /*
  * fill in extended accounting fields
  */
@@ -90,18 +92,18 @@ void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
        mm = get_task_mm(p);
        if (mm) {
                /* adjust to KB unit */
-               stats->hiwater_rss   = mm->hiwater_rss * PAGE_SIZE / KB;
-               stats->hiwater_vm    = mm->hiwater_vm * PAGE_SIZE / KB;
+               stats->hiwater_rss   = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB;
+               stats->hiwater_vm    = get_mm_hiwater_vm(mm)  * PAGE_SIZE / KB;
                mmput(mm);
        }
-       stats->read_char        = p->ioac.rchar;
-       stats->write_char       = p->ioac.wchar;
-       stats->read_syscalls    = p->ioac.syscr;
-       stats->write_syscalls   = p->ioac.syscw;
+       stats->read_char        = p->ioac.rchar & KB_MASK;
+       stats->write_char       = p->ioac.wchar & KB_MASK;
+       stats->read_syscalls    = p->ioac.syscr & KB_MASK;
+       stats->write_syscalls   = p->ioac.syscw & KB_MASK;
 #ifdef CONFIG_TASK_IO_ACCOUNTING
-       stats->read_bytes       = p->ioac.read_bytes;
-       stats->write_bytes      = p->ioac.write_bytes;
-       stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes;
+       stats->read_bytes       = p->ioac.read_bytes & KB_MASK;
+       stats->write_bytes      = p->ioac.write_bytes & KB_MASK;
+       stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes & KB_MASK;
 #else
        stats->read_bytes       = 0;
        stats->write_bytes      = 0;
@@ -120,19 +122,23 @@ void acct_update_integrals(struct task_struct *tsk)
        if (likely(tsk->mm)) {
                cputime_t time, dtime;
                struct timeval value;
+               unsigned long flags;
                u64 delta;
 
+               local_irq_save(flags);
                time = tsk->stime + tsk->utime;
-               dtime = cputime_sub(time, tsk->acct_timexpd);
+               dtime = 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;
+                       goto out;
                tsk->acct_timexpd = time;
                tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm);
                tsk->acct_vm_mem1 += delta * tsk->mm->total_vm;
+       out:
+               local_irq_restore(flags);
        }
 }