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On machines with very large numbers of cpus, tables that are dimensioned
by NR_IRQS get very large, especially the irq_desc table. They are also
very sparsely used. When the cpu count is > MAX_IO_APICS, use MAX_IO_APICS
to set NR_IRQS, otherwise use NR_CPUS.
Signed-off-by: Alan Mayer <ajm@sgi.com>
Reviewed-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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This adds items to the taststats struct to account for user and system
time based on scaling the CPU frequency and instruction issue rates.
Adds account_(user|system)_time_scaled callbacks which architectures
can use to account for time using this mechanism.
Signed-off-by: Michael Neuling <mikey@neuling.org>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Jay Lan <jlan@engr.sgi.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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as recent CPUs introduce a third running state, after "user" and
"system", we need a new field, "guest", in cpustat to store the time
used by the CPU to run virtual CPU. Modify /proc/stat to display this
new field.
Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net>
Acked-by: Avi Kivity <avi@qumranet.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Signed-off-by: David Woodhouse <dwmw2@infradead.org>
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replaces for_each_cpu with for_each_possible_cpu().
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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cleanup: use for_each_cpu() instead of an open-coded NR_CPUS loop.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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This patch introduces the concept of (virtual) cputime. Each architecture
can define its method to measure cputime. The main idea is to define a
cputime_t type and a set of operations on it (see asm-generic/cputime.h).
Then use the type for utime, stime, cutime, cstime, it_virt_value,
it_virt_incr, it_prof_value and it_prof_incr and use the cputime operations
for each access to these variables. The default implementation is jiffies
based and the effect of this patch for architectures which use the default
implementation should be neglectible.
There is a second type cputime64_t which is necessary for the kernel_stat
cpu statistics. The default cputime_t is 32 bit and based on HZ, this will
overflow after 49.7 days. This is not enough for kernel_stat (ihmo not
enough for a processes too), so it is necessary to have a 64 bit type.
The third thing that gets introduced by this patch is an additional field
for the /proc/stat interface: cpu steal time. An architecture can account
cpu steal time by calls to the account_stealtime function. The cpu which
backs a virtual processor doesn't spent all of its time for the virtual
cpu. To get meaningful cpu usage numbers this involuntary wait time needs
to be accounted and exported to user space.
From: Hugh Dickins <hugh@veritas.com>
The p->signal check in account_system_time is insufficient. If the timer
interrupt hits near the end of exit_notify, after EXIT_ZOMBIE has been set,
another cpu may release_task (NULLifying p->signal) in between
account_system_time's check and check_rlimit's dereference. Nor should
account_it_prof risk send_sig. But surely account_user_time is safe?
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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From: Kingsley Cheung <kingsley@aurema.com>
A number of scheduler counters wrap around after 47 days. The context-switch
counter can wrap around after considerably less time.
Convert them to 64-bit values.
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Enable irq statistics for s390*. We defined NR_IRQS to 2, one for all i/o
interrupts and one for all external interrupts.
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kstat_this_cpu() is defined in terms of per_cpu instead of __get_cpu_var.
This patch changes that, and uses it everywhere appropriate. The sched.c
change puts it in a local variable, which helps gcc generate better code.
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Patch from Dipankar Sarma <dipankar@gamebox.net>
This is a trivial cleanup removing two old unused macros from
kernel_stat.h that made no sense with the new per-CPU kstat.
Also included a few finicky coding style changes. Please apply.
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Patch from Ravikiran G Thirumalai <kiran@in.ibm.com>
1. Break out disk stats from kernel_stat and move disk stat to blkdev.h
2. Group cpu stat in kernel_stat and make them "per_cpu" instead of
the NR_CPUS array
3. Remove EXPORT_SYMBOL(kstat) from ksyms.c (as I noticed that no module is
using kstat)
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Patch from Rik adds "I/O wait" statistics to /proc/stat.
This allows us to determine how much system time is being spent
awaiting IO completion. This is an important statistic, as it tends to
directly subtract from job completion time.
procps-2.0.9 is OK with this, but doesn't report it.
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Moves the VM accounting out of /proc/stat and into /proc/vmstat.
The VM accounting is now per-cpu.
It also moves kstat.pgpgin and kstat.pgpgout into /proc/vmstat.
Which is a bit of a duplication of /proc/diskstats (SARD), but it's
easy, super-cheap and makes life a lot easier for all the system
monitoring applications which we just broke.
We now require procps 2.0.9.
Updated versions of top and vmstat are available at http://surriel.com
and the Cygnus CVS is uptodate for these changes. (Rik has the CVS
info at the above site).
This tidies up kernel_stat quite a lot - it now only contains CPU
things (interrupts and CPU loads) and disk things. So we now have:
/proc/stat: CPU things and disk things
/proc/vmstat: VM things (plus pgpgin, pgpgout)
The SARD patch removes the disk things from /proc/stat as well.
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A patch from Rik which adds some operational statitics to the VM.
In /proc/meminfo:
PageTables: Amount of memory used for process pagetables
PteChainTot: Amount of memory allocated for pte_chain objects
PteChainUsed: Amount of memory currently in use for pte chains.
In /proc/stat:
pageallocs: Number of pages allocated in the page allocator
pagefrees: Number of pages returned to the page allocator
(These can be used to measure the allocation rate)
pageactiv: Number of pages activated (moved to the active list)
pagedeact: Number of pages deactivated (moved to the inactive list)
pagefault: Total pagefaults
majorfault: Major pagefaults
pagescan: Number of pages which shrink_cache looked at
pagesteal: Number of pages which shrink_cache freed
pageoutrun: Number of calls to try_to_free_pages()
allocstall: Number of calls to balance_classzone()
Rik will be writing a userspace app which interprets these things.
The /proc/meminfo stats are efficient, but the /proc/stat accumulators
will cause undesirable cacheline bouncing. We need to break the disk
statistics out of struct kernel_stat and make everything else in there
per-cpu. If that doesn't happen in time for 2.6 then we disable
KERNEL_STAT_INC().
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This patch removes the concept of "logical" CPU numbers, in
preparation for CPU hotplugging.
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from struct kernel_stat. They are unused and not visible
in any way to userspace.
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- Kai Germaschewski: ISDN updates
- Al Viro: start moving buffer cache indexing to "struct block_device *"
- Greg KH: USB update
- Russell King: fix up some ARM merge issues
- Ingo Molnar: scalable scheduler
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- Anton Altaparmakov: NTFS error checking
- Johannes Erdfelt: USB updates
- OGAWA Hirofumi: FAT update
- Alan Cox: driver + s390 update merge
- Richard Henderson: fix alpha sigsuspend error return value
- Marcelo Tosatti: per-zone VM shortage
- Daniel Phillips: generic use-once optimization instead of drop-behind
- Bjorn Wesen: Cris architecture update
- Anton Altaparmakov: support for Windows Dynamic Disks
- James Washer: LDT loading SMP bug fix
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