1. 30 Oct, 2005 5 commits
    • Rik Van Riel's avatar
      [PATCH] swaptoken tuning · fcdae29a
      Rik Van Riel authored
      It turns out that the original swap token implementation, by Song Jiang, only
      enforced the swap token while the task holding the token is handling a page
      fault.  This patch approximates that, without adding an additional flag to the
      mm_struct, by checking whether the mm->mmap_sem is held for reading, like the
      page fault code does.
      
      This patch has the effect of automatically, and gradually, disabling the
      enforcement of the swap token when there is little or no paging going on, and
      "turning up" the intensity of the swap token code the more the task holding
      the token is thrashing.
      
      Thanks to Song Jiang for pointing out this aspect of the token based thrashing
      control concept.
      
      The new code shows a slight degradation over the old swap token code, but
      still a big win over running without the swap token.
      
      2.6.12+ swap token disabled
      
      $ for i in `seq 10` ; do /usr/bin/time ./qsbench -n 30000000 -p 3 ; done
      101.74user 23.13system 8:26.91elapsed 24%CPU (0avgtext+0avgdata 0maxresident)k
      0inputs+0outputs (38597major+430315minor)pagefaults 0swaps
      101.98user 24.91system 8:03.06elapsed 26%CPU (0avgtext+0avgdata 0maxresident)k
      0inputs+0outputs (33939major+430457minor)pagefaults 0swaps
      101.93user 22.12system 7:34.90elapsed 27%CPU (0avgtext+0avgdata 0maxresident)k
      0inputs+0outputs (33166major+421267minor)pagefaults 0swaps
      101.82user 22.38system 8:31.40elapsed 24%CPU (0avgtext+0avgdata 0maxresident)k
      0inputs+0outputs (39338major+433262minor)pagefaults 0swaps
      
      2.6.12+ swap token enabled, timeout 300 seconds
      
      $ for i in `seq 4` ; do /usr/bin/time ./qsbench -n 30000000 -p 3 ; done
      102.58user 16.08system 3:41.44elapsed 53%CPU (0avgtext+0avgdata 0maxresident)k
      0inputs+0outputs (19707major+285786minor)pagefaults 0swaps
      102.07user 19.56system 4:00.64elapsed 50%CPU (0avgtext+0avgdata 0maxresident)k
      0inputs+0outputs (19012major+299259minor)pagefaults 0swaps
      102.64user 18.25system 4:07.31elapsed 48%CPU (0avgtext+0avgdata 0maxresident)k
      0inputs+0outputs (21990major+304831minor)pagefaults 0swaps
      101.39user 19.41system 5:15.81elapsed 38%CPU (0avgtext+0avgdata 0maxresident)k
      0inputs+0outputs (24850major+323321minor)pagefaults 0swaps
      
      2.6.12+ with new swap token code, timeout 300 seconds
      
      $ for i in `seq 4` ; do /usr/bin/time ./qsbench -n 30000000 -p 3 ; done
      101.87user 24.66system 5:53.20elapsed 35%CPU (0avgtext+0avgdata 0maxresident)k
      0inputs+0outputs (26848major+363497minor)pagefaults 0swaps
      102.83user 19.95system 4:17.25elapsed 47%CPU (0avgtext+0avgdata 0maxresident)k
      0inputs+0outputs (19946major+305722minor)pagefaults 0swaps
      102.09user 19.46system 5:12.57elapsed 38%CPU (0avgtext+0avgdata 0maxresident)k
      0inputs+0outputs (25461major+334994minor)pagefaults 0swaps
      101.67user 20.61system 4:52.97elapsed 41%CPU (0avgtext+0avgdata 0maxresident)k
      0inputs+0outputs (22190major+329508minor)pagefaults 0swaps
      Signed-off-by: default avatarRik Van Riel <riel@redhat.com>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      fcdae29a
    • Rik Van Riel's avatar
      [PATCH] add sem_is_read/write_locked() · eb92f4ef
      Rik Van Riel authored
      Add sem_is_read/write_locked functions to the read/write semaphores, along the
      same lines of the *_is_locked spinlock functions.  The swap token tuning patch
      uses sem_is_read_locked; sem_is_write_locked is added for completeness.
      Signed-off-by: default avatarRik van Riel <riel@redhat.com>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      eb92f4ef
    • Ivan Kokshaysky's avatar
      [PATCH] fix alpha breakage · 63f324cf
      Ivan Kokshaysky authored
      barrier.h uses barrier() in non-SMP case.  And doesn't include compiler.h.
      
      Cc: Al Viro <viro@ftp.linux.org.uk>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      63f324cf
    • YOSHIFUJI Hideaki's avatar
      [PATCH] TIMERS: add missing compensation for HZ == 250 · 4b8f573b
      YOSHIFUJI Hideaki authored
      Add missing compensation for (HZ == 250) != (1 << SHIFT_HZ) in
      second_overflow().
      Signed-off-by: default avatarYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
      Cc: "David S. Miller" <davem@davemloft.net>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      4b8f573b
    • Christoph Lameter's avatar
      [PATCH] vmalloc_node · 930fc45a
      Christoph Lameter authored
      This patch adds
      
      vmalloc_node(size, node)	-> Allocate necessary memory on the specified node
      
      and
      
      get_vm_area_node(size, flags, node)
      
      and the other functions that it depends on.
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      930fc45a
  2. 29 Oct, 2005 35 commits