linux.git/fs/proc/proc_misc.c, branch v2.6.23

x86_64: Avoid too many remote cpu references due to /proc/stat

2007-07-22T01:37:09+00:00

Too many remote cpu references due to /proc/stat.

On x86_64, with newer kernel versions, kstat_irqs is a bit of a problem.
On every call to kstat_irqs, the process brings in per-cpu data from all
online cpus.  Doing this for NR_IRQS, which is now 256 + 32 * NR_CPUS
results in (256+32*63) * 63 remote cpu references on a 64 cpu config.
/proc/stat is parsed by common commands like top, who etc, causing lots
of cacheline transfers

This statistic seems useless.  Other 'big iron' arches disable this.

AK: changed to remove for all SMP setups
AK: add comment

Signed-off-by: Ravikiran Thirumalai 
Signed-off-by: Andi Kleen 
Signed-off-by: Linus Torvalds

Avoid too many remote cpu references due to /proc/stat

2007-07-19T17:04:43+00:00

Optimize show_stat to collect per-irq information just once.

On x86_64, with newer kernel versions, kstat_irqs is a bit of a problem.
On every call to kstat_irqs, the process brings in per-cpu data from all
online cpus.  Doing this for NR_IRQS, which is now 256 + 32 * NR_CPUS
results in (256+32*63) * 63 remote cpu references on a 64 cpu config.
Considering the fact that we already compute this value per-cpu, we can
save on the remote references as below.

Signed-off-by: Alok N Kataria 
Signed-off-by: Ravikiran Thirumalai 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Use boot based time for uptime in /proc

2007-07-16T16:05:41+00:00

Commit 411187fb05cd11676b0979d9fbf3291db69dbce2 caused uptime not to increase
during suspend.  This may cause confusion so I restore the old behaviour by
using the boot based time instead of monotonic for uptime.

Signed-off-by: Tomas Janousek 
Acked-by: John Stultz 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Use boot based time for process start time and boot time in /proc

2007-07-16T16:05:41+00:00

Commit 411187fb05cd11676b0979d9fbf3291db69dbce2 caused boot time to move and
process start times to become invalid after suspend.  Using boot based time
for those restores the old behaviour and fixes the issue.

[akpm@linux-foundation.org: little cleanup]
Signed-off-by: Tomas Janousek 
Cc: Tomas Smetana 
Acked-by: John Stultz 
Cc: Thomas Gleixner 
Cc: Ingo Molnar 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

proc: cleanup: use seq_release_private() where appropriate

2007-05-08T18:15:09+00:00

We can save some lines of code by using seq_release_private().

Signed-off-by: Martin Peschke 
Cc: "Eric W. Biederman" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

header cleaning: don't include smp_lock.h when not used

2007-05-08T18:15:07+00:00

Remove includes of  where it is not used/needed.
Suggested by Al Viro.

Builds cleanly on x86_64, i386, alpha, ia64, powerpc, sparc,
sparc64, and arm (all 59 defconfigs).

Signed-off-by: Randy Dunlap 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm/slab.c: proper prototypes

2007-05-07T19:12:52+00:00

Add proper prototypes in include/linux/slab.h.

Signed-off-by: Adrian Bunk 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] mark struct file_operations const 6

2007-02-12T17:48:45+00:00

Many struct file_operations in the kernel can be "const".  Marking them const
moves these to the .rodata section, which avoids false sharing with potential
dirty data.  In addition it'll catch accidental writes at compile time to
these shared resources.

Signed-off-by: Arjan van de Ven 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] proc_misc warning fix

2007-02-11T18:51:31+00:00

fs/proc/proc_misc.c: In function 'proc_misc_init':
fs/proc/proc_misc.c:764: warning: unused variable 'entry'

Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] Drop get_zone_counts()

2007-02-11T18:51:18+00:00

Values are available via ZVC sums.

Signed-off-by: Christoph Lameter 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds