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  1. 08 Sep, 2004 7 commits
    • Joseph Fannin's avatar
      [PATCH] ppc build fix · e94456cc
      Joseph Fannin authored 
      The #include <asm/io.h> comes from bk-ia64.patch time interpolation logic
patch from Cristoph Lameter.
Signed-off-by: default avatarJoseph Fannin <jhf@rivenstone.net>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      e94456cc
    • Christoph Lameter's avatar
      [PATCH] Time interpolator: Scalability enhancements and high resolution time for IA64 · bd46a4f1
      Christoph Lameter authored 
      This has been in the ia64 (and hence -mm) trees for a couple of months.

Changelog:
 * Affects only architectures which define CONFIG_TIME_INTERPOLATION
   (currently only IA64)
 * Genericize time interpolation, make time interpolators easily usable
   and provide instructions on how to use the interpolator for other
   architectures.
 * Provide nanosecond resolution for clock_gettime and an accuracy
   up to the time interpolator time base.
 * clock_getres() reports resolution of underlying time basis which
   is typically <50ns and may be 1ns on some systems.
 * Make time interpolator self-tuning to limit time jumps
   and to make the interpolators work correctly on systems with
   broken time base specifications.
 * SMP scalability: Make clock_gettime and gettimeofday scale O(1)
   by removing the cmpxchg for most clocks (tested for up to 512 CPUs)
 * IA64: provide asm fastcall that doubles the performance
   of gettimeofday and clock_gettime on SGI and other IA64 systems
   (asm fastcalls scale O(1) together with the scalability fixes).
 * IA64: provide nojitter kernel option so that IA64 systems with
   correctly synchronized ITC counters may also enjoy the
   scalability enhancements.

Performance measurements for single calls (ITC cycles):

A. 4 way Intel IA64 SMP system (kmart)

ITC offsets:
kmart:/usr/src/noship-tests # dmesg|grep synchr
CPU 1: synchronized ITC with CPU 0 (last diff 1 cycles, maxerr 417 cycles)
CPU 2: synchronized ITC with CPU 0 (last diff 2 cycles, maxerr 417 cycles)
CPU 3: synchronized ITC with CPU 0 (last diff 1 cycles, maxerr 417 cycles)

A.1. Current kernel code

kmart:/usr/src/noship-tests # ./dmt
gettimeofday cycles: 3737 220 215 215 215 215 215 215 215 215
clock_gettime(REAL) cycles: 4058 575 564 576 565 566 558 558 558 558
clock_gettime(MONO) cycles: 1583 621 609 609 609 609 609 609 609 609
clock_gettime(PROCESS) cycles: 71428 298 259 259 259 259 259 259 259 259
clock_gettime(THREAD) cycles: 3982 336 290 298 298 298 298 286 286 286

A.2 New code using cmpxchg

kmart:/usr/src/noship-tests # ./dmt
gettimeofday cycles: 3145 213 216 213 213 213 213 213 213 213
clock_gettime(REAL) cycles: 3185 230 210 210 210 210 210 210 210 210
clock_gettime(MONO) cycles: 284 217 217 216 216 216 216 216 216 216
clock_gettime(PROCESS) cycles: 68857 289 270 259 259 259 259 259 259 259
clock_gettime(THREAD) cycles: 3862 339 298 298 298 298 290 286 286 286

A.3 New code with cmpxchg switched off (nojitter kernel option)

kmart:/usr/src/noship-tests # ./dmt
gettimeofday cycles: 3195 219 219 212 212 212 212 212 212 212
clock_gettime(REAL) cycles: 3003 228 205 205 205 205 205 205 205 205
clock_gettime(MONO) cycles: 279 209 209 209 208 208 208 208 208 208
clock_gettime(PROCESS) cycles: 65849 292 259 259 268 270 270 259 259 259

B. SGI SN2 system running 512 IA64 CPUs.

B.1. Current kernel code

[root@ascender noship-tests]# ./dmt
gettimeofday cycles: 17221 1028 1007 1004 1004 1004 1010 25928 1002 1003
clock_gettime(REAL) cycles: 10388 1099 1055 1044 1064 1063 1051 1056 1061 1056
clock_gettime(MONO) cycles: 2363 96 96 96 96 96 96 96 96 96
clock_gettime(PROCESS) cycles: 46537 804 660 666 666 666 666 666 666 666
clock_gettime(THREAD) cycles: 10945 727 710 684 685 686 685 686 685 686

B.2 New code

ascender:~/noship-tests # ./dmt
gettimeofday cycles: 3874 610 588 588 588 588 588 588 588 588
clock_gettime(REAL) cycles: 3893 612 588 582 588 588 588 588 588 588
clock_gettime(MONO) cycles: 686 595 595 588 588 588 588 588 588 588
clock_gettime(PROCESS) cycles: 290759 322 269 269 259 265 265 265 259 259
clock_gettime(THREAD) cycles: 5153 358 306 298 296 304 290 298 298 298

Scalability of time functions (in time it takes to do a million calls):
=======================================================================

A. 4 way Intel IA SMP system (kmart)
A.1 Current code

kmart:/usr/src/noship-tests # ./todscale -n1000000
 CPUS       WALL  WALL/CPUS
    1      0.192      0.192
    2      1.125      0.563
    4      9.229      2.307

A.2 New code using cmpxchg

kmart:/usr/src/noship-tests # ./todscale
 CPUS       WALL  WALL/CPUS
    1      0.188      0.188
    2      0.457      0.229
    4      0.413      0.103

(the measurement with 4 cpus may fluctuate up to 15.x somehow)

A.3 New code without cmpxchg (nojitter kernel option)

kmart:/usr/src/noship-tests # ./todscale -n10000000
 CPUS       WALL  WALL/CPUS
    1      0.180      0.180
    2      0.180      0.090
    4      0.252      0.063

B. SGI SN2 system running 512 IA64 CPUs.

The system has a global monotonic clock and therefore has
no need for compensation. Current code uses a cmpxchg. New
code has no cmpxchg.

B.1 current code

ascender:~/noship-tests # ./todscale
 CPUS       WALL  WALL/CPUS
    1      0.850      0.850
    2      1.767      0.884
    4      6.124      1.531
    8     20.777      2.597
   16     57.693      3.606
   32    164.688      5.146
   64    456.647      7.135
  128   1093.371      8.542
  256   2778.257     10.853
(System crash at 512 CPUs)

B.2 New code

ascender:~/noship-tests # ./todscale -n1000000
 CPUS       WALL  WALL/CPUS
    1      0.426      0.426
    2      0.429      0.215
    4      0.436      0.109
    8      0.452      0.057
   16      0.454      0.028
   32      0.457      0.014
   64      0.459      0.007
  128      0.466      0.004
  256      0.474      0.002
  512      0.518      0.001

Clock Accuracy
==============
A. 4 CPU SMP system

A.1 Old code

kmart:/usr/src/noship-tests # ./cdisp
          Gettimeofday() = 1092124757.270305000
           CLOCK_REALTIME= 1092124757.270382000 resolution= 0.000976563
          CLOCK_MONOTONIC=         89.696726590 resolution= 0.000976563
 CLOCK_PROCESS_CPUTIME_ID=          0.001242507 resolution= 0.000000001
  CLOCK_THREAD_CPUTIME_ID=          0.001255310 resolution= 0.000000001

A.2 New code

kmart:/usr/src/noship-tests # ./cdisp
          Gettimeofday() = 1092124478.194530000
           CLOCK_REALTIME= 1092124478.194603399 resolution= 0.000000001
          CLOCK_MONOTONIC=         88.198315204 resolution= 0.000000001
 CLOCK_PROCESS_CPUTIME_ID=          0.001241235 resolution= 0.000000001
  CLOCK_THREAD_CPUTIME_ID=          0.001254747 resolution= 0.000000001
Signed-off-by: default avatarChristoph Lameter <clameter@sgi.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      bd46a4f1
    • Adam Kropelin's avatar
      [PATCH] input: Eliminate hiddev.h dependency on hid.h · c9daeae6
      Adam Kropelin authored 
      hiddev.h needs hid.h but doesn't include it.  Since hid.h is private anyway
just eliminate the need for it it in the first place.
Signed-off-by: default avatarAdam Kropelin <akropel1@rochester.rr.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      c9daeae6
    • Adam Kropelin's avatar
      [PATCH] input: Fix hiddev disconnect-while-in-use oops · 38a3d44d
      Adam Kropelin authored 
      hid-core calls hiddev_disconnect() when the underlying device goes away
(hot unplug or system shutdown).  Normally, hiddev_disconnect() will clean
up nicely and return to hid-core who then frees the hid structure.
However, if the corresponding hiddev node is open at disconnect time,
hiddev delays the majority of disconnect work until the device is closed
via hiddev_release().  hiddev_release() calls hiddev_cleanup() which
proceeds to dereference the hid struct which hid-core freed back when the
hardware was disconnected.  Oops.

To solve this, we change hiddev_disconnect() to deregister the hiddev minor
and invalidate its table entry immediately and delay only the freeing of
the hiddev structure itself.  We're protected against future operations on
the fd since the major fops check hiddev->exists.
Signed-off-by: default avatarAdam Kropelin <akropel1@rochester.rr.com>
Signed-off-by: default avatarVojtech Pavlik <vojtech@suse.cz>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      38a3d44d
    • Geert Uytterhoeven's avatar
      [PATCH] Convert in-kernel users of EXPORT_SYMBOL_NOVERS() to EXPORT_SYMBOL() · 0ed7d2e4
      Geert Uytterhoeven authored 
      Convert all in-kernel users of the deprecated EXPORT_SYMBOL_NOVERS() to
EXPORT_SYMBOL().
Signed-off-by: default avatarGeert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      0ed7d2e4
    • Jan Harkes's avatar
      [PATCH] Coda - fix sparse warnings · 4b5e78cf
      Jan Harkes authored 
      I reused the coda_file_read wrapper for sendfile and accidentally left
the __user tag on the buffer. This patch should fix the sparse warnings.
Signed-off-by: default avatarJan Harkes <jaharkes@cs.cmu.edu>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      4b5e78cf
    • Linus Torvalds's avatar
      Merge bk://drm.bkbits.net/drm-fntbl · 3d1331e4
      Linus Torvalds authored 
      into ppc970.osdl.org:/home/torvalds/v2.6/linux
      3d1331e4
  3. 09 Sep, 2004 5 commits
  5. 07 Sep, 2004 28 commits
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