linux.git/arch/i386/kernel/process.c, branch v2.6.22

SLUB: i386 support

2007-05-12T18:26:22+00:00

SLUB cannot run on i386 at this point because i386 uses the page->private and
page->index field of slab pages for the pgd cache.

Make SLUB run on i386 by replacing the pgd slab cache with a quicklist.
Limit the changes as much as possible. Leave the improvised linked list in place
etc etc. This has been working here for a couple of weeks now.

Acked-by: William Lee Irwin III 
Signed-off-by: Christoph Lameter 
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

[PATCH] i386: Convert PDA into the percpu section

2007-05-02T17:27:16+00:00

Currently x86 (similar to x84-64) has a special per-cpu structure
called "i386_pda" which can be easily and efficiently referenced via
the %fs register.  An ELF section is more flexible than a structure,
allowing any piece of code to use this area.  Indeed, such a section
already exists: the per-cpu area.

So this patch:
(1) Removes the PDA and uses per-cpu variables for each current member.
(2) Replaces the __KERNEL_PDA segment with __KERNEL_PERCPU.
(3) Creates a per-cpu mirror of __per_cpu_offset called this_cpu_off, which
    can be used to calculate addresses for this CPU's variables.
(4) Simplifies startup, because %fs doesn't need to be loaded with a
    special segment at early boot; it can be deferred until the first
    percpu area is allocated (or never for UP).

The result is less code and one less x86-specific concept.

Signed-off-by: Rusty Russell 
Signed-off-by: Jeremy Fitzhardinge 
Signed-off-by: Andi Kleen 
Cc: Andi Kleen

[PATCH] i386: i386 separate hardware-defined TSS from Linux additions

2007-05-02T17:27:13+00:00

On Thu, 2007-03-29 at 13:16 +0200, Andi Kleen wrote:
> Please clean it up properly with two structs.

Not sure about this, now I've done it.  Running it here.

If you like it, I can do x86-64 as well.

==
lguest defines its own TSS struct because the "struct tss_struct"
contains linux-specific additions.  Andi asked me to split the struct
in processor.h.

Unfortunately it makes usage a little awkward.

Signed-off-by: Rusty Russell 
Signed-off-by: Andi Kleen

[PATCH] x86: Don't use MWAIT on AMD Family 10

2007-05-02T17:27:12+00:00

It doesn't put the CPU into deeper sleep states, so it's better to use the standard
idle loop to save power. But allow to reenable it anyways for benchmarking.

I also removed the obsolete idle=halt on i386

Cc: andreas.herrmann@amd.com

Signed-off-by: Andi Kleen

Revert "[PATCH] i386: add idle notifier"

2007-02-26T17:21:46+00:00

This reverts commit 2ff2d3d74705d34ab71b21f54634fcf50d57bdd5.

Uwe Bugla reports that he cannot mount a floppy drive any more, and Jiri
Slaby bisected it down to this commit.

Benjamin LaHaise also points out that this is a big hot-path, and that
interrupt delivery while idle is very common and should not go through
all these expensive gyrations.

Fix up conflicts in arch/i386/kernel/apic.c and arch/i386/kernel/irq.c
due to other unrelated irq changes.

Cc: Stephane Eranian 
Cc: Andi Kleen 
Cc: Andrew Morton 
Cc: Uwe Bugla 
Cc: Jiri Slaby 
Signed-off-by: Linus Torvalds

[PATCH] i386 prepare for dyntick

2007-02-16T16:13:59+00:00

Prepare i386 for dyntick: idle handler callbacks.

Signed-off-by: Ingo Molnar 
Signed-off-by: Thomas Gleixner 
Cc: john stultz 
Cc: Roman Zippel 
Cc: Andi Kleen 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] i386: add idle notifier

2007-02-13T12:26:22+00:00

Add a notifier mechanism to the low level idle loop.  You can register a
callback function which gets invoked on entry and exit from the low level idle
loop.  The low level idle loop is defined as the polling loop, low-power call,
or the mwait instruction.  Interrupts processed by the idle thread are not
considered part of the low level loop.

The notifier can be used to measure precisely how much is spent in useless
execution (or low power mode).  The perfmon subsystem uses it to turn on/off
monitoring.

Signed-off-by: stephane eranian 
Signed-off-by: Andrew Morton 
Signed-off-by: Andi Kleen

[PATCH] i386: iOPL handling for paravirt guests

2007-02-13T12:26:21+00:00

I found a clever way to make the extra IOPL switching invisible to
non-paravirt compiles - since kernel_rpl is statically defined to be zero
there, and only non-zero rpl kernel have a problem restoring IOPL, as popf
does not restore IOPL flags unless run at CPL-0.

Signed-off-by: Zachary Amsden 
Signed-off-by: Andi Kleen 
Cc: Andi Kleen 
Cc: Jeremy Fitzhardinge 
Cc: Rusty Russell 
Cc: Chris Wright 
Signed-off-by: Andrew Morton

[PATCH] i386: paravirt CPU hypercall batching mode

2007-02-13T12:26:21+00:00

The VMI ROM has a mode where hypercalls can be queued and batched.  This turns
out to be a significant win during context switch, but must be done at a
specific point before side effects to CPU state are visible to subsequent
instructions.  This is similar to the MMU batching hooks already provided.
The same hooks could be used by the Xen backend to implement a context switch
multicall.

To explain a bit more about lazy modes in the paravirt patches, basically, the
idea is that only one of lazy CPU or MMU mode can be active at any given time.
 Lazy MMU mode is similar to this lazy CPU mode, and allows for batching of
multiple PTE updates (say, inside a remap loop), but to avoid keeping some
kind of state machine about when to flush cpu or mmu updates, we just allow
one or the other to be active.  Although there is no real reason a more
comprehensive scheme could not be implemented, there is also no demonstrated
need for this extra complexity.

Signed-off-by: Zachary Amsden 
Signed-off-by: Andi Kleen 
Cc: Andi Kleen 
Cc: Jeremy Fitzhardinge 
Cc: Rusty Russell 
Cc: Chris Wright 
Signed-off-by: Andrew Morton