Skip to content

K
Kernel

openeuler / Kernel
1 年多 前同步成功

通知 8
Star 0
Fork 0
K
Kernel
切换分支/标签
  1. 05 3月, 2009 9 次提交
  3. 04 3月, 2009 2 次提交
  5. 03 3月, 2009 14 次提交
  7. 02 3月, 2009 15 次提交
    • J
      x86: add forward decl for tss_struct · 2fb6b2a0
      由 Jeremy Fitzhardinge 提交于 
      Its the correct thing to do before using the struct in a prototype.
Signed-off-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      2fb6b2a0
    • J
      x86: unify chunks of kernel/process*.c · 389d1fb1
      由 Jeremy Fitzhardinge 提交于 
      With x86-32 and -64 using the same mechanism for managing the
tss io permissions bitmap, large chunks of process*.c are
trivially unifyable, including:

 - exit_thread
 - flush_thread
 - __switch_to_xtra (along with tsc enable/disable)

and as bonus pickups:

 - sys_fork
 - sys_vfork

(Note: asmlinkage expands to empty on x86-64)
Signed-off-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      389d1fb1
    • J
      x86-32: use non-lazy io bitmap context switching · db949bba
      由 Jeremy Fitzhardinge 提交于 
      Impact: remove 32-bit optimization to prepare unification

x86-32 and -64 differ in the way they context-switch tasks
with io permission bitmaps.  x86-64 simply copies the next
tasks io bitmap into place (if any) on context switch.  x86-32
invalidates the bitmap on context switch, so that the next
IO instruction will fault; at that point it installs the
appropriate IO bitmap.

This makes context switching IO-bitmap-using tasks a bit more
less expensive, at the cost of making the next IO instruction
slower due to the extra fault.  This tradeoff only makes sense
if IO-bitmap-using processes are relatively common, but they
don't actually use IO instructions very often.

However, in a typical desktop system, the only process likely
to be using IO bitmaps is the X server, and nothing at all on
a server.  Therefore the lazy context switch doesn't really win
all that much, and its just a gratuitious difference from
64-bit code.

This patch removes the lazy context switch, with a view to
unifying this code in a later change.
Signed-off-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      db949bba
    • J
      x86_32: apic/numaq_32, fix section mismatch · b6122b38
      由 Jiri Slaby 提交于 
      Remove __cpuinitdata section placement for translation_table
structure, since it is referenced from a functions within .text.
Signed-off-by: NJiri Slaby <jirislaby@gmail.com>
Cc: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Cc: H. Peter Anvin <hpa@zytor.com>
      b6122b38
    • J
      x86_32: apic/summit_32, fix section mismatch · 2fcb1f1f
      由 Jiri Slaby 提交于 
      Remove __init section placement for some functions/data, so that
we don't get section mismatch warnings.

Also make inline function instead of empty setup_summit macro.

[v2]
One of them was not caught by
DEBUG_SECTION_MISMATCH=y
magic. Fix it.
Signed-off-by: NJiri Slaby <jirislaby@gmail.com>
Cc: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Cc: H. Peter Anvin <hpa@zytor.com>
      2fcb1f1f
    • J
      x86_32: apic/es7000_32, fix section mismatch · 871d78c6
      由 Jiri Slaby 提交于 
      Remove __init section placement for some functions, so that we don't
get section mismatch warnings.

[v2]:
2 of them were not caught by
DEBUG_SECTION_MISMATCH=y
magic. Fix it.
Signed-off-by: NJiri Slaby <jirislaby@gmail.com>
Cc: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Cc: H. Peter Anvin <hpa@zytor.com>
      871d78c6
    • J
      x86_32: apic/summit_32, fix cpu_mask_to_apicid · fae176d6
      由 Jiri Slaby 提交于 
      Perform same-cluster checking even for masks with all (nr_cpu_ids)
bits set and report correct apicid on success instead.

While at it, convert it to for_each_cpu and newer cpumask api.
Signed-off-by: NJiri Slaby <jirislaby@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      fae176d6
    • J
      x86_32: apic/es7000_32, fix cpu_mask_to_apicid · 0edc0b32
      由 Jiri Slaby 提交于 
      Perform same-cluster checking even for masks with all (nr_cpu_ids)
bits set and report BAD_APICID on failure.

While at it, convert it to for_each_cpu.
Signed-off-by: NJiri Slaby <jirislaby@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      0edc0b32
    • J
      x86_32: apic/es7000_32, cpu_mask_to_apicid cleanup · c2b20cbd
      由 Jiri Slaby 提交于 
      Remove es7000_cpu_mask_to_apicid_cluster completely, because it's
almost the same as es7000_cpu_mask_to_apicid except 2 code paths.
One of them is about to be removed soon, the another should be
BAD_APICID (it's a fail path).

The _cluster one was not invoked on apic->cpu_mask_to_apicid_and
anyway, since there was no _cluster_and variant.

Also use newer cpumask functions.
Signed-off-by: NJiri Slaby <jirislaby@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      c2b20cbd
    • J
      x86_32: apic/bigsmp_32, de-inline functions · 9694cd6c
      由 Jiri Slaby 提交于 
      The ones which go only into struct apic are de-inlined
by compiler anyway, so remove the inline specifier from them.

Afterwards, remove bigsmp_setup_portio_remap completely as it
is unused.
Signed-off-by: NJiri Slaby <jirislaby@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      9694cd6c
    • I
      x86, mm: dont use non-temporal stores in pagecache accesses · f1800536
      由 Ingo Molnar 提交于 
      Impact: standardize IO on cached ops

On modern CPUs it is almost always a bad idea to use non-temporal stores,
as the regression in this commit has shown it:

  30d697fa: x86: fix performance regression in write() syscall

The kernel simply has no good information about whether using non-temporal
stores is a good idea or not - and trying to add heuristics only increases
complexity and inserts fragility.

The regression on cached write()s took very long to be found - over two
years. So dont take any chances and let the hardware decide how it makes
use of its caches.

The only exception is drivers/gpu/drm/i915/i915_gem.c: there were we are
absolutely sure that another entity (the GPU) will pick up the dirty
data immediately and that the CPU will not touch that data before the
GPU will.

Also, keep the _nocache() primitives to make it easier for people to
experiment with these details. There may be more clear-cut cases where
non-cached copies can be used, outside of filemap.c.

Cc: Salman Qazi <sqazi@google.com>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      f1800536
    • P
      x86 mmiotrace: fix race with release_kmmio_fault_page() · 340430c5
      由 Pekka Paalanen 提交于 
      There was a theoretical possibility to a race between arming a page in
post_kmmio_handler() and disarming the page in
release_kmmio_fault_page():

cpu0                             cpu1
------------------------------------------------------------------
mmiotrace shutdown
enter release_kmmio_fault_page
                                 fault on the page
                                 disarm the page
disarm the page
                                 handle the MMIO access
                                 re-arm the page
put the page on release list
remove_kmmio_fault_pages()
                                 fault on the page
                                 page not known to mmiotrace
                                 fall back to do_page_fault()
                                 *KABOOM*

(This scenario also shows the double disarm case which is allowed.)

Fixed by acquiring kmmio_lock in post_kmmio_handler() and checking
if the page is being released from mmiotrace.
Signed-off-by: NPekka Paalanen <pq@iki.fi>
Cc: Stuart Bennett <stuart@freedesktop.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      340430c5
    • S
      x86 mmiotrace: improve handling of secondary faults · 3e39aa15
      由 Stuart Bennett 提交于 
      Upgrade some kmmio.c debug messages to warnings.
Allow secondary faults on probed pages to fall through, and only log
secondary faults that are not due to non-present pages.

Patch edited by Pekka Paalanen.
Signed-off-by: NStuart Bennett <stuart@freedesktop.org>
Signed-off-by: NPekka Paalanen <pq@iki.fi>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      3e39aa15
    • P
      x86 mmiotrace: split set_page_presence() · 0b700a6a
      由 Pekka Paalanen 提交于 
      From 36772dcb6ffbbb68254cbfc379a103acd2fbfefc Mon Sep 17 00:00:00 2001
From: Pekka Paalanen <pq@iki.fi>
Date: Sat, 28 Feb 2009 21:34:59 +0200

Split set_page_presence() in kmmio.c into two more functions set_pmd_presence()
and set_pte_presence(). Purely code reorganization, no functional changes.
Signed-off-by: NPekka Paalanen <pq@iki.fi>
Cc: Stuart Bennett <stuart@freedesktop.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      0b700a6a
    • P
      x86 mmiotrace: fix save/restore page table state · 5359b585
      由 Pekka Paalanen 提交于 
      From baa99e2b32449ec7bf147c234adfa444caecac8a Mon Sep 17 00:00:00 2001
From: Pekka Paalanen <pq@iki.fi>
Date: Sun, 22 Feb 2009 20:02:43 +0200

Blindly setting _PAGE_PRESENT in disarm_kmmio_fault_page() overlooks the
possibility, that the page was not present when it was armed.

Make arm_kmmio_fault_page() store the previous page presence in struct
kmmio_fault_page and use it on disarm.

This patch was originally written by Stuart Bennett, but Pekka Paalanen
rewrote it a little different.
Signed-off-by: NPekka Paalanen <pq@iki.fi>
Cc: Stuart Bennett <stuart@freedesktop.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      5359b585