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  1. 17 12月, 2010 5 次提交
    • C
      kprobes: Use this_cpu_ops · b76834bc
      由 Christoph Lameter 提交于 
      Use this_cpu ops in various places to optimize per cpu data access.

Cc: Jason Baron <jbaron@redhat.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Acked-by: NH. Peter Anvin <hpa@zytor.com>
Signed-off-by: NChristoph Lameter <cl@linux.com>
Signed-off-by: NTejun Heo <tj@kernel.org>
      b76834bc
    • C
      drivers: Replace __get_cpu_var with __this_cpu_read if not used for an address. · 4a6f4fe8
      由 Christoph Lameter 提交于 
      __get_cpu_var() can be replaced with this_cpu_read and will then use a single
read instruction with implied address calculation to access the correct per cpu
instance.

However, the address of a per cpu variable passed to __this_cpu_read() cannot be
determed (since its an implied address conversion through segment prefixes).
Therefore apply this only to uses of __get_cpu_var where the addres of the
variable is not used.

V3->V4:
	- Move one instance of this_cpu_inc_return to a later patch
	  so that this one can go in without percpu infrastructrure
	  changes.

Sedat: fixed compile failure caused by an extra ')'.

Cc: Neil Horman <nhorman@tuxdriver.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Sedat Dilek <sedat.dilek@gmail.com>
Acked-by: NH. Peter Anvin <hpa@zytor.com>
Signed-off-by: NChristoph Lameter <cl@linux.com>
Signed-off-by: NTejun Heo <tj@kernel.org>
      4a6f4fe8
    • C
      vmstat: Optimize zone counter modifications through the use of this cpu operations · 12938a92
      由 Christoph Lameter 提交于 
      this cpu operations can be used to slightly optimize the function. The
changes will avoid some address calculations and replace them with the
use of the percpu segment register.

If one would have this_cpu_inc_return and this_cpu_dec_return then it
would be possible to optimize inc_zone_page_state and
dec_zone_page_state even more.

V1->V2:
	- Fix __dec_zone_state overflow handling
	- Use s8 variables for temporary storage.

V2->V3:
	- Put __percpu annotations in correct places.
Reviewed-by: NPekka Enberg <penberg@kernel.org>
Acked-by: NH. Peter Anvin <hpa@zytor.com>
Signed-off-by: NChristoph Lameter <cl@linux.com>
Signed-off-by: NTejun Heo <tj@kernel.org>
      12938a92
    • C
      percpucounter: Optimize __percpu_counter_add a bit through the use of this_cpu() options. · 819a72af
      由 Christoph Lameter 提交于 
      The this_cpu_* options can be used to optimize __percpu_counter_add a bit. Avoids
some address arithmetic and saves 12 bytes.

Before:


00000000000001d3 <__percpu_counter_add>:
 1d3:	55                   	push   %rbp
 1d4:	48 89 e5             	mov    %rsp,%rbp
 1d7:	41 55                	push   %r13
 1d9:	41 54                	push   %r12
 1db:	53                   	push   %rbx
 1dc:	48 89 fb             	mov    %rdi,%rbx
 1df:	48 83 ec 08          	sub    $0x8,%rsp
 1e3:	4c 8b 67 30          	mov    0x30(%rdi),%r12
 1e7:	65 4c 03 24 25 00 00 	add    %gs:0x0,%r12
 1ee:	00 00
 1f0:	4d 63 2c 24          	movslq (%r12),%r13
 1f4:	48 63 c2             	movslq %edx,%rax
 1f7:	49 01 f5             	add    %rsi,%r13
 1fa:	49 39 c5             	cmp    %rax,%r13
 1fd:	7d 0a                	jge    209 <__percpu_counter_add+0x36>
 1ff:	f7 da                	neg    %edx
 201:	48 63 d2             	movslq %edx,%rdx
 204:	49 39 d5             	cmp    %rdx,%r13
 207:	7f 1e                	jg     227 <__percpu_counter_add+0x54>
 209:	48 89 df             	mov    %rbx,%rdi
 20c:	e8 00 00 00 00       	callq  211 <__percpu_counter_add+0x3e>
 211:	4c 01 6b 18          	add    %r13,0x18(%rbx)
 215:	48 89 df             	mov    %rbx,%rdi
 218:	41 c7 04 24 00 00 00 	movl   $0x0,(%r12)
 21f:	00
 220:	e8 00 00 00 00       	callq  225 <__percpu_counter_add+0x52>
 225:	eb 04                	jmp    22b <__percpu_counter_add+0x58>
 227:	45 89 2c 24          	mov    %r13d,(%r12)
 22b:	5b                   	pop    %rbx
 22c:	5b                   	pop    %rbx
 22d:	41 5c                	pop    %r12
 22f:	41 5d                	pop    %r13
 231:	c9                   	leaveq
 232:	c3                   	retq


After:

00000000000001d3 <__percpu_counter_add>:
 1d3:	55                   	push   %rbp
 1d4:	48 63 ca             	movslq %edx,%rcx
 1d7:	48 89 e5             	mov    %rsp,%rbp
 1da:	41 54                	push   %r12
 1dc:	53                   	push   %rbx
 1dd:	48 89 fb             	mov    %rdi,%rbx
 1e0:	48 8b 47 30          	mov    0x30(%rdi),%rax
 1e4:	65 44 8b 20          	mov    %gs:(%rax),%r12d
 1e8:	4d 63 e4             	movslq %r12d,%r12
 1eb:	49 01 f4             	add    %rsi,%r12
 1ee:	49 39 cc             	cmp    %rcx,%r12
 1f1:	7d 0a                	jge    1fd <__percpu_counter_add+0x2a>
 1f3:	f7 da                	neg    %edx
 1f5:	48 63 d2             	movslq %edx,%rdx
 1f8:	49 39 d4             	cmp    %rdx,%r12
 1fb:	7f 21                	jg     21e <__percpu_counter_add+0x4b>
 1fd:	48 89 df             	mov    %rbx,%rdi
 200:	e8 00 00 00 00       	callq  205 <__percpu_counter_add+0x32>
 205:	4c 01 63 18          	add    %r12,0x18(%rbx)
 209:	48 8b 43 30          	mov    0x30(%rbx),%rax
 20d:	48 89 df             	mov    %rbx,%rdi
 210:	65 c7 00 00 00 00 00 	movl   $0x0,%gs:(%rax)
 217:	e8 00 00 00 00       	callq  21c <__percpu_counter_add+0x49>
 21c:	eb 04                	jmp    222 <__percpu_counter_add+0x4f>
 21e:	65 44 89 20          	mov    %r12d,%gs:(%rax)
 222:	5b                   	pop    %rbx
 223:	41 5c                	pop    %r12
 225:	c9                   	leaveq
 226:	c3                   	retq
Reviewed-by: NPekka Enberg <penberg@kernel.org>
Reviewed-by: NTejun Heo <tj@kernel.org>
Reviewed-by: NMathieu Desnoyers <mathieu.desnoyers@efficios.com>
Acked-by: NH. Peter Anvin <hpa@zytor.com>
Signed-off-by: NChristoph Lameter <cl@linux.com>
Signed-off-by: NTejun Heo <tj@kernel.org>
      819a72af
    • T
      MAINTAINERS: Add percpu allocator entry · e72df0b8
      由 Tejun Heo 提交于 
      Add me and Christoph Lameter as maintainers for the percpu memory
allocator.
Signed-off-by: NTejun Heo <tj@kernel.org>
Cc: Christoph Lameter <cl@linux-foundation.org>
Acked-by: NChristoph Lameter <cl@linux-foundation.org>
      e72df0b8
  3. 07 12月, 2010 8 次提交
  5. 06 12月, 2010 6 次提交
  7. 05 12月, 2010 4 次提交
    • G
      parisc: Fix GSC PS/2 driver name for keyboard and mouse · 7bfbeae9
      由 Guy Martin 提交于 
      Fix kernel warnings caused by the driver name of GSC PS/2 containing '/'.

The following warnings are observed on a K410 system :

[   10.700000] name 'GSC PS/2 keyboard'
[   10.732000] ------------[ cut here ]------------
[   10.772000] WARNING: at fs/proc/generic.c:323
[   10.828000] Modules linked in:
[   10.916000]
[   10.916000]      YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI
[   10.936000] PSW: 00000000000001000000000000001111 Not tainted
[   10.992000] r00-03  0004000f 104fe3e0 10201ea0 00000000
[   11.060000] r04-07  4fc405c8 00000006 4fc405c8 4fc40694
[   11.124000] r08-11  4fc40708 10438aa0 00000001 1043bfc8
[   11.184000] r12-15  104ff2a0 104ff2a0 4fc38634 104ff2a0
[   11.248000] r16-19  f0001570 10479af0 f000006c 1044fe50
[   11.308000] r20-23  00000000 00000028 104cd858 00000000
[   11.372000] r24-27  ffffffff 0000000e 1044fe10 1043bbe0
[   11.436000] r28-31  0000002b 00000078 4fc40800 0000000d
[   11.496000] sr00-03  00000000 00000000 00000000 00000000
[   11.560000] sr04-07  00000000 00000000 00000000 00000000
[   11.624000]
[   11.688000] IASQ: 00000000 00000000 IAOQ: 10201ea0 10201ea4
[   11.704000]  IIR: 03ffe01f    ISR: 00000000  IOR: 0000000d
[   11.772000]  CPU:        0   CR30: 4fc40000 CR31: f01043b0
[   11.836000]  ORIG_R28: 4fc40940
[   11.904000]  IAOQ[0]: __xlate_proc_name+0x90/0xd0
[   11.940000]  IAOQ[1]: __xlate_proc_name+0x94/0xd0
[   11.996000]  RP(r2): __xlate_proc_name+0x90/0xd0
[   12.052000] Backtrace:
[   12.108000]  [<10257790>] vsnprintf+0x290/0x4f4
[   12.136000]
[   12.188000] ---[ end trace 91bf6ece17e322dd ]---
[   12.208000] serio: GSC PS/2 keyboard port at 0x0001c000 irq 19 @ 10:12:7
[   12.264000] name 'GSC PS/2 mouse'
[   12.344000] ------------[ cut here ]------------
[   12.384000] WARNING: at fs/proc/generic.c:323
[   12.436000] Modules linked in:
[   12.524000]
[   12.528000]      YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI
[   12.544000] PSW: 00000000000001000000000000001111 Tainted: G        W
[   12.600000] r00-03  0004000f 104fe3e0 10201ea0 00000000
[   12.680000] r04-07  4fc405c8 00000006 4fc405c8 4fc40694
[   12.740000] r08-11  4fc40708 10438aa0 00000001 1043bfc8
[   12.804000] r12-15  104ff2a0 104ff2a0 4fc38634 104ff2a0
[   12.868000] r16-19  f0001570 10479af0 f000006c 1044fe50
[   12.928000] r20-23  00000000 00000025 104cd858 00000000
[   12.992000] r24-27  ffffffff 0000000e 1044fe10 1043bbe0
[   13.056000] r28-31  00000028 00000078 4fc40800 0000000d
[   13.116000] sr00-03  00000000 00000000 00000000 00000000
[   13.180000] sr04-07  00000000 00000000 00000000 00000000
[   13.244000]
[   13.308000] IASQ: 00000000 00000000 IAOQ: 10201ea0 10201ea4
[   13.324000]  IIR: 03ffe01f    ISR: 00000000  IOR: 0000000d
[   13.392000]  CPU:        0   CR30: 4fc40000 CR31: f01043b0
[   13.456000]  ORIG_R28: 4fc40940
[   13.524000]  IAOQ[0]: __xlate_proc_name+0x90/0xd0
[   13.560000]  IAOQ[1]: __xlate_proc_name+0x94/0xd0
[   13.616000]  RP(r2): __xlate_proc_name+0x90/0xd0
[   13.672000] Backtrace:
[   13.728000]  [<10257790>] vsnprintf+0x290/0x4f4
[   13.756000]
[   13.808000] ---[ end trace 91bf6ece17e322de ]---
[   13.828000] serio: GSC PS/2 mouse port at 0x00020100 irq 19 @ 10:12:8
Signed-off-by: NGuy Martin <gmsoft@tuxicoman.be>
Acked-by: NHelge Deller <deller@gmx.de>
Signed-off-by: NKyle McMartin <kyle@mcmartin.ca>
      7bfbeae9
    • G
      parisc: KittyHawk LCD fix · 79a04296
      由 Guy Martin 提交于 
      K class aka KittyHawk don't have LED support on their LCD. Installing
HP-UX confirmed this. The current led_wq fills the LCD with black
characters each time it runs.

The patch prevents the led_wq workqueue and its proc entry to be
created for KittyHawk machines.

It also increase min_cmd_delay as currently, one character out of two
is lost when a string is sent to the LCD.
Signed-off-by: NGuy Martin <gmsoft@tuxicoman.be>
Signed-off-by: NKyle McMartin <kyle@mcmartin.c>
      79a04296
    • J
      parisc: convert the rest of the irq handlers to simple/percpu · 51890613
      由 James Bottomley 提交于 
      The generic conversion eliminates the spurious no_ack and no_end
routines, converts all the cascaded handlers to handle_simple_irq() and
makes iosapic use a modified handle_percpu_irq() to become the same as
the CPU irq's.  This isn't an essential change, but it eliminates the
mask/unmask overhead of handle_level_irq().
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>
Tested-by: NHelge Deller <deller@gmx.de>
Signed-off-by: NKyle McMartin <kyle@mcmartin.ca>
      51890613
    • J
      parisc: fix dino/gsc interrupts · d16cd297
      由 James Bottomley 提交于 
      The essential problem we're currently having is that dino (and gsc) is a
cascaded CPU interrupt.  Under the old __do_IRQ() handler, our CPU
interrupts basically did an ack followed by an end.  In the new scheme,
we replaced them with level handlers which do a mask, an ack and then an
unmask (but no end).  Instead, with the renaming of end to eoi, we
actually want to call the percpu flow handlers, because they actually
have all the characteristics we want.

This patch does the conversion and gets my C360 booting again.
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>
Signed-off-by: NKyle McMartin <kyle@mcmartin.ca>
      d16cd297
  9. 04 12月, 2010 11 次提交
  11. 03 12月, 2010 6 次提交