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  1. 17 2月, 2007 4 次提交
  3. 13 2月, 2007 1 次提交
    • E
      [PATCH] x86-64: get rid of ARCH_HAVE_XTIME_LOCK · 5809f9d4
      由 Eric Dumazet 提交于 
      ARCH_HAVE_XTIME_LOCK is used by x86_64 arch .  This arch needs to place a
read only copy of xtime_lock into vsyscall page.  This read only copy is
named __xtime_lock, and xtime_lock is defined in
arch/x86_64/kernel/vmlinux.lds.S as an alias.  So the declaration of
xtime_lock in kernel/timer.c was guarded by ARCH_HAVE_XTIME_LOCK define,
defined to true on x86_64.

We can get same result with _attribute__((weak)) in the declaration. linker
should do the job.
Signed-off-by: NEric Dumazet <dada1@cosmosbay.com>
Signed-off-by: NAndi Kleen <ak@suse.de>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
      5809f9d4
  5. 12 2月, 2007 3 次提交
  7. 23 12月, 2006 1 次提交
  9. 14 12月, 2006 1 次提交
    • E
      [PATCH] Optimize calc_load() · cd7175ed
      由 Eric Dumazet 提交于 
      calc_load() is called by timer interrupt to update avenrun[].  It currently
calls nr_active() at each timer tick (HZ per second), while the update of
avenrun[] is done only once every 5 seconds.  (LOAD_FREQ=5 Hz)

nr_active() is quite expensive on SMP machines, since it has to sum up
nr_running and nr_uninterruptible of all online CPUS, bringing foreign
dirty cache lines.

This patch is an optimization of calc_load() so that nr_active() is called
only if we need it.

The use of unlikely() is welcome since the condition is true only once every
5*HZ time.
Signed-off-by: NEric Dumazet <dada1@cosmosbay.com>
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: N"Siddha, Suresh B" <suresh.b.siddha@intel.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      cd7175ed
  11. 11 12月, 2006 2 次提交
  13. 01 10月, 2006 4 次提交
    • A
      [PATCH] kill wall_jiffies · 8ef38609
      由 Atsushi Nemoto 提交于 
      With 2.6.18-rc4-mm2, now wall_jiffies will always be the same as jiffies.
So we can kill wall_jiffies completely.

This is just a cleanup and logically should not change any real behavior
except for one thing: RTC updating code in (old) ppc and xtensa use a
condition "jiffies - wall_jiffies == 1".  This condition is never met so I
suppose it is just a bug.  I just remove that condition only instead of
kill the whole "if" block.

[heiko.carstens@de.ibm.com: s390 build fix and cleanup]
Signed-off-by: NAtsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: Andi Kleen <ak@muc.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Ian Molton <spyro@f2s.com>
Cc: Mikael Starvik <starvik@axis.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Hirokazu Takata <takata.hirokazu@renesas.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp>
Cc: Richard Curnow <rc@rc0.org.uk>
Cc: William Lee Irwin III <wli@holomorphy.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Miles Bader <uclinux-v850@lsi.nec.co.jp>
Cc: Chris Zankel <chris@zankel.net>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      8ef38609
    • R
      [PATCH] ntp: add time_adjust to tick length · 8f807f8d
      由 Roman Zippel 提交于 
      This folds update_ntp_one_tick() into second_overflow() and adds time_adjust
to the tick length, this makes time_next_adjust unnecessary.  This slightly
changes the adjtime() behaviour, instead of applying it to the next tick, it's
applied to the next second.
Signed-off-by: NRoman Zippel <zippel@linux-m68k.org>
Cc: john stultz <johnstul@us.ibm.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      8f807f8d
    • R
      [PATCH] ntp: add ntp_update_frequency · b0ee7556
      由 Roman Zippel 提交于 
      This introduces ntp_update_frequency() and deinlines ntp_clear() (as it's not
performance critical).  ntp_update_frequency() calculates the base tick length
using tick_usec and adds a base adjustment, in case the frequency doesn't
divide evenly by HZ.
Signed-off-by: NRoman Zippel <zippel@linux-m68k.org>
Cc: john stultz <johnstul@us.ibm.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      b0ee7556
    • J
      [PATCH] NTP: Move all the NTP related code to ntp.c · 4c7ee8de
      由 john stultz 提交于 
      Move all the NTP related code to ntp.c

[akpm@osdl.org: cleanups, build fix]
Signed-off-by: NJohn Stultz <johnstul@us.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      4c7ee8de
  15. 30 9月, 2006 4 次提交
  17. 15 8月, 2006 1 次提交
  19. 01 8月, 2006 3 次提交
  21. 15 7月, 2006 2 次提交
  23. 11 7月, 2006 1 次提交
  25. 04 7月, 2006 3 次提交
  27. 28 6月, 2006 2 次提交
  29. 27 6月, 2006 6 次提交
  31. 26 6月, 2006 1 次提交
  33. 23 6月, 2006 1 次提交
    • P
      [PATCH] When CONFIG_BASE_SMALL=1, cascade() may enter an infinite loop · 3439dd86
      由 Porpoise 提交于 
      When CONFIG_BASE_SAMLL=1, cascade() in may enter the infinite loop.
Because of CONFIG_BASE_SMALL=1(TVR_BITS=6 and TVN_BITS=4), the list
base->tv5 may cascade into base->tv5.  So, the kernel enters the infinite
loop in the function cascade().

I created a test module to verify this bug, and a patch to fix it.

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/timer.h>
#if 0
#include <linux/kdb.h>
#else
#define kdb_printf printk
#endif

#define TVN_BITS (CONFIG_BASE_SMALL ? 4 : 6)
#define TVR_BITS (CONFIG_BASE_SMALL ? 6 : 8)
#define TVN_SIZE (1 << TVN_BITS)
#define TVR_SIZE (1 << TVR_BITS)
#define TVN_MASK (TVN_SIZE - 1)
#define TVR_MASK (TVR_SIZE - 1)

#define TV_SIZE(N)  (N*TVN_BITS  + TVR_BITS)

struct timer_list timer0;
struct timer_list dummy_timer1;
struct timer_list dummy_timer2;

void dummy_timer_fun(unsigned long data) {
}
unsigned long j=0;
void check_timer_base(unsigned long data)
{
        kdb_printf("check_timer_base %08x\n",jiffies);
        mod_timer(&timer0,(jiffies & (~0xFFF)) + 0x1FFF);
}

int init_module(void)
{
        init_timer(&timer0);
        timer0.data = (unsigned long)0;
        timer0.function = check_timer_base;
        mod_timer(&timer0,jiffies+1);

        init_timer(&dummy_timer1);
        dummy_timer1.data = (unsigned long)0;
        dummy_timer1.function = dummy_timer_fun;

        init_timer(&dummy_timer2);
        dummy_timer2.data = (unsigned long)0;
        dummy_timer2.function = dummy_timer_fun;

        j=jiffies;
        j&=(~((1<<TV_SIZE(3))-1));
        j+=(1<<TV_SIZE(3));
        j+=(1<<TV_SIZE(4));

        kdb_printf("mod_timer %08x\n",j);

        mod_timer(&dummy_timer1, j );
        mod_timer(&dummy_timer2, j );

        return 0;
}

void cleanup_module()
{
        del_timer_sync(&timer0);
        del_timer_sync(&dummy_timer1);
        del_timer_sync(&dummy_timer2);
}

(Cleanups from Oleg)

[oleg@tv-sign.ru: use list_replace_init()]
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Matt Mackall <mpm@selenic.com>
Signed-off-by: NOleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      3439dd86