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I've noticed that xtime_lock and timerlist_lock ends up on the same
cacheline all the time (atleaset on x86). Not a good thing for
loads with high xxx_timer and do_gettimeofday counts I guess (networking etc).
Here's a trivial fix.
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- introduce new type of context-switch locking, this is a must-have for
ia64 and sparc64.
- load_balance() bug noticed by Scott Rhine and myself: scan the
whole list to find imbalance number of tasks, not just the tail
of the list.
- sched_yield() fix: use current->array not rq->active.
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Stop using "struct tms" internally - always use timer ticks (or one of
the sane timeval/timespec types) instead.
Explicitly convert to clock_t when copying to user space for the old
broken interfaces that still use "clock_t".
Clean up and unify jiffies<->timeval conversion.
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This micropatch adds unlikely() macro into add_timer() bug check code.
Without this path gcc 3.1 makes bad thing reordering printk() into
the middle of function body.
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Nobody's using it any more, kill:
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This is actually part of the work I've been doing to remove BHs, but it
stands by itself.
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x86-64 needs an own special declaration of jiffies_64.
prepare for this by moving the jiffies_64 declaration from
kernel/timer.c down into each architecture.
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Looks like sys_sysinfo has not been touched in years. Among other
things, it uses a global cli() for protection; I switched it to an
existing rwlock. I also pulled it out of info.c and stuck it in timer.c
(I choose timer.c because it shares dependencies there already).
The details:
- move sys_sysinfo to kernel/timer.c from kernel/info.c:
why one small syscall got its own file is beyond me.
- delete kernel/info.c
- stop the global cli! now grab a read_lock on xtime_lock.
this is safe as we moved the write_unlock on xtime_lock
down one line to cover the calculating of avenrun.
- trivial code cleanup
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On ia64 MP machines, we use the cycle counter register of each CPU to
obtain fine-grained time-stamps. At boot-time, we synchronize the
counters as close as possible (similar to x86, though with a different
algorithm). But even with this synchronization, there is still a
small (really: tiny) chance that a process bouncing from one CPU to
another could observe time going backwards. To guard against this, I
maintain a global variable called "last_time_offset" which keeps track
of the largest time-interpolation value returned so far. Most of this
is in platform-specific code (arch/ia64/kernel/time.c), but there are
a handful of places in platform-independent code where this variable
needs to be cleared to zero. This is what the patch below does. I
didn't put it inside CONFIG_IA64 because I think this can be useful
for other platforms, too. I suppose I could put it inside CONFIG_SMP
though this would make the code uglier. If you think it's OK, please
apply, otherwise, I'd appreciate your feedback.
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This is William Irwin's algorithmically O(1) version of
count_active_tasks (which is currently O(n) for n total tasks on the
system).
I like it a lot: we become O(1) because now we count uninterruptible
tasks, so we can return (nr_uninterruptible + nr_running). It does not
introduce any overhead or hurt the case for small n, so I have no
complaints.
This copy has a small optimization over the original posting, but is
otherwise the same thing wli posted earlier. I have tested to make sure
this returns accurate results and that the kernel profile improves.
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Ok, here it is. The following arch are not covered:
Mips, Mips64 in 32-bit mode, parisc in __LP64__ mode.
In addition, x86_64 mentions jiffies in the existing script.
This may be a problem.
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This patch (#1) just converts the task_struct to use struct list_head rather
than direct pointers for maintaining the children list.
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- David Howells: abtract out "current->need_resched" as "need_resched()"
- Frank Davis: ide-tape update for bio
- various: header file fixups
- Jens Axboe: fix up bio/ide/highmem issues
- Kai Germaschewski: ISDN update
- Tim Waugh: parport update
- Patrik Mochel: initcall update
- Greg KH: USB and Compaq PCI hotplug updates
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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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- Christoph Hellwig: scsi_register_module cleanup
- Mikael Pettersson: apic.c LVTERR fixes
- Russell King: ARM update (including bio update for icside)
- Jens Axboe: more bio updates
- Al Viro: make ready to switch bread away from kdev_t..
- Davide Libenzi: scheduler cleanups
- Anders Gustafsson: LVM fixes for bio
- Richard Gooch: devfs update
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- various: fix some module exports uncovered by stricter error checking
- Urban Widmark: make smbfs use same error define names as samba and win32
- Greg KH: USB update
- Tom Rini: MPC8xx ppc update
- Matthew Wilcox: rd.c page cache flushing fix
- Richard Gooch: devfs race fix: rwsem for symlinks
- Björn Wesen: Cris arch update
- Nikita Danilov: reiserfs cleanup
- Tim Waugh: parport update
- Peter Rival: update alpha SMP bootup to match wait_init_idle fixes
- Trond Myklebust: lockd/grace period fix
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- remember to increment the version number
- Chris Mason: reiserfs mark_journal_new and bh leak fix
- Richard Gooch: devfs update
- Alexander Viro: further FS cleanup (superblock list)
- David Woodhouse: MTD update
- Kai Germaschewski: ISDN update (stanford checker fixes etc)
- Rich Baum: gcc-3.0 warning fixes
- Jeff Garzik: network driver updates
- Geert Uytterhoeven: m68k fbdev logo merge glitch fix
- Andrea Arcangeli: fix signal return path
- David Miller: Sparc updates
- Johannes Erdfelt: USB update
- Carsten Otte, Andries Brouwer: don't clear blk_size unconditionally
on partition check
- Martin Frey: alpha Sable irq fix
- Paul Mackerras: PPC softirq update
- Patrick Mochel: PCI power management infrastructure
- Robert Siemer: miroSOUND driver update
- Neil Brown: knfsd updates, including ability to export ReiserFS filesystems
- Trond Myklebust: NFS readdir fixup, don't update atime on client
- Andrew Morton: truncate_inode_pages speedup
- Paul Menage: make inode quota count all inodes..
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