procfs: do not confuse jiffies with cputime64_t
Andreas Schwab [Wed, 28 Dec 2011 23:57:15 +0000 (15:57 -0800)]
Commit 2a95ea6c0d129b4 ("procfs: do not overflow get_{idle,iowait}_time
for nohz") did not take into account that one some architectures jiffies
and cputime use different units.

This causes get_idle_time() to return numbers in the wrong units, making
the idle time fields in /proc/stat wrong.

Instead of converting the usec value returned by
get_cpu_{idle,iowait}_time_us to units of jiffies, use the new function
usecs_to_cputime64 to convert it to the correct unit of cputime64_t.

Signed-off-by: Andreas Schwab <schwab@linux-m68k.org>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: "Artem S. Tashkinov" <t.artem@mailcity.com>
Cc: Dave Jones <davej@redhat.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/ia64/include/asm/cputime.h
arch/powerpc/include/asm/cputime.h
arch/s390/include/asm/cputime.h
fs/proc/stat.c
include/asm-generic/cputime.h

index 6073b18..5a274af 100644 (file)
@@ -60,6 +60,7 @@ typedef u64 cputime64_t;
  */
 #define cputime_to_usecs(__ct)         ((__ct) / NSEC_PER_USEC)
 #define usecs_to_cputime(__usecs)      ((__usecs) * NSEC_PER_USEC)
+#define usecs_to_cputime64(__usecs)    usecs_to_cputime(__usecs)
 
 /*
  * Convert cputime <-> seconds
index 1cf20bd..98b7c4b 100644 (file)
@@ -150,6 +150,8 @@ static inline cputime_t usecs_to_cputime(const unsigned long us)
        return ct;
 }
 
+#define usecs_to_cputime64(us)         usecs_to_cputime(us)
+
 /*
  * Convert cputime <-> seconds
  */
index 0814348..b9acaaa 100644 (file)
@@ -87,6 +87,8 @@ usecs_to_cputime(const unsigned int m)
        return (cputime_t) m * 4096;
 }
 
+#define usecs_to_cputime64(m)          usecs_to_cputime(m)
+
 /*
  * Convert cputime to milliseconds and back.
  */
index 2a30d67..0855e6f 100644 (file)
@@ -32,7 +32,7 @@ static cputime64_t get_idle_time(int cpu)
                idle = kstat_cpu(cpu).cpustat.idle;
                idle = cputime64_add(idle, arch_idle_time(cpu));
        } else
-               idle = nsecs_to_jiffies64(1000 * idle_time);
+               idle = usecs_to_cputime64(idle_time);
 
        return idle;
 }
@@ -46,7 +46,7 @@ static cputime64_t get_iowait_time(int cpu)
                /* !NO_HZ so we can rely on cpustat.iowait */
                iowait = kstat_cpu(cpu).cpustat.iowait;
        else
-               iowait = nsecs_to_jiffies64(1000 * iowait_time);
+               iowait = usecs_to_cputime64(iowait_time);
 
        return iowait;
 }
index 62ce682..12a1764 100644 (file)
@@ -40,6 +40,7 @@ typedef u64 cputime64_t;
  */
 #define cputime_to_usecs(__ct)         jiffies_to_usecs(__ct)
 #define usecs_to_cputime(__msecs)      usecs_to_jiffies(__msecs)
+#define usecs_to_cputime64(__msecs)    nsecs_to_jiffies64((__msecs) * 1000)
 
 /*
  * Convert cputime to seconds and back.