1. 28 9月, 2006 2 次提交
    • M
      [S390] Inline assembly cleanup. · 94c12cc7
      Martin Schwidefsky 提交于
      Major cleanup of all s390 inline assemblies. They now have a common
      coding style. Quite a few have been shortened, mainly by using register
      asm variables. Use of the EX_TABLE macro helps  as well. The atomic ops,
      bit ops and locking inlines new use the Q-constraint if a newer gcc
      is used.  That results in slightly better code.
      
      Thanks to Christian Borntraeger for proof reading the changes.
      Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
      94c12cc7
    • M
      [S390] __div64_32 for 31 bit. · d9f7a745
      Martin Schwidefsky 提交于
      The clocksource infrastructure introduced with commit
      ad596171 broke 31 bit s390.
      The reason is that the do_div() primitive for 31 bit always
      had a restriction: it could only divide an unsigned 64 bit
      integer by an unsigned 31 bit integer. The clocksource code
      now uses do_div() with a base value that has the most
      significant bit set. The result is that clock->cycle_interval
      has a funny value which causes the linux time to jump around
      like mad.
      The solution is "obvious": implement a proper __div64_32
      function for 31 bit s390.
      Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
      d9f7a745
  2. 27 9月, 2006 1 次提交
  3. 26 9月, 2006 3 次提交
  4. 25 9月, 2006 1 次提交
  5. 20 9月, 2006 15 次提交
  6. 19 9月, 2006 1 次提交
  7. 17 9月, 2006 1 次提交
  8. 17 7月, 2006 2 次提交
  9. 15 7月, 2006 1 次提交
    • S
      [PATCH] remove set_wmb - arch removal · 52393ccc
      Steven Rostedt 提交于
      set_wmb should not be used in the kernel because it just confuses the
      code more and has no benefit.  Since it is not currently used in the
      kernel this patch removes it so that new code does not include it.
      
      All archs define set_wmb(var, value) to do { var = value; wmb(); }
      while(0) except ia64 and sparc which use a mb() instead.  But this is
      still moot since it is not used anyway.
      
      Hasn't been tested on any archs but x86 and x86_64 (and only compiled
      tested)
      Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      52393ccc
  10. 12 7月, 2006 6 次提交
  11. 04 7月, 2006 3 次提交
  12. 03 7月, 2006 1 次提交
  13. 01 7月, 2006 1 次提交
    • C
      [PATCH] zoned vm counters: create vmstat.c/.h from page_alloc.c/.h · f6ac2354
      Christoph Lameter 提交于
      NOTE: ZVC are *not* the lightweight event counters.  ZVCs are reliable whereas
      event counters do not need to be.
      
      Zone based VM statistics are necessary to be able to determine what the state
      of memory in one zone is.  In a NUMA system this can be helpful for local
      reclaim and other memory optimizations that may be able to shift VM load in
      order to get more balanced memory use.
      
      It is also useful to know how the computing load affects the memory
      allocations on various zones.  This patchset allows the retrieval of that data
      from userspace.
      
      The patchset introduces a framework for counters that is a cross between the
      existing page_stats --which are simply global counters split per cpu-- and the
      approach of deferred incremental updates implemented for nr_pagecache.
      
      Small per cpu 8 bit counters are added to struct zone.  If the counter exceeds
      certain thresholds then the counters are accumulated in an array of
      atomic_long in the zone and in a global array that sums up all zone values.
      The small 8 bit counters are next to the per cpu page pointers and so they
      will be in high in the cpu cache when pages are allocated and freed.
      
      Access to VM counter information for a zone and for the whole machine is then
      possible by simply indexing an array (Thanks to Nick Piggin for pointing out
      that approach).  The access to the total number of pages of various types does
      no longer require the summing up of all per cpu counters.
      
      Benefits of this patchset right now:
      
      - Ability for UP and SMP configuration to determine how memory
        is balanced between the DMA, NORMAL and HIGHMEM zones.
      
      - loops over all processors are avoided in writeback and
        reclaim paths. We can avoid caching the writeback information
        because the needed information is directly accessible.
      
      - Special handling for nr_pagecache removed.
      
      - zone_reclaim_interval vanishes since VM stats can now determine
        when it is worth to do local reclaim.
      
      - Fast inline per node page state determination.
      
      - Accurate counters in /sys/devices/system/node/node*/meminfo. Current
        counters are counting simply which processor allocated a page somewhere
        and guestimate based on that. So the counters were not useful to show
        the actual distribution of page use on a specific zone.
      
      - The swap_prefetch patch requires per node statistics in order to
        figure out when processors of a node can prefetch. This patch provides
        some of the needed numbers.
      
      - Detailed VM counters available in more /proc and /sys status files.
      
      References to earlier discussions:
      V1 http://marc.theaimsgroup.com/?l=linux-kernel&m=113511649910826&w=2
      V2 http://marc.theaimsgroup.com/?l=linux-kernel&m=114980851924230&w=2
      V3 http://marc.theaimsgroup.com/?l=linux-kernel&m=115014697910351&w=2
      V4 http://marc.theaimsgroup.com/?l=linux-kernel&m=115024767318740&w=2
      
      Performance tests with AIM7 did not show any regressions.  Seems to be a tad
      faster even.  Tested on ia64/NUMA.  Builds fine on i386, SMP / UP.  Includes
      fixes for s390/arm/uml arch code.
      
      This patch:
      
      Move counter code from page_alloc.c/page-flags.h to vmstat.c/h.
      
      Create vmstat.c/vmstat.h by separating the counter code and the proc
      functions.
      
      Move the vm_stat_text array before zoneinfo_show.
      
      [akpm@osdl.org: s390 build fix]
      [akpm@osdl.org: HOTPLUG_CPU build fix]
      Signed-off-by: NChristoph Lameter <clameter@sgi.com>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      f6ac2354
  14. 30 6月, 2006 1 次提交
    • C
      [AF_UNIX]: Datagram getpeersec · 877ce7c1
      Catherine Zhang 提交于
      This patch implements an API whereby an application can determine the
      label of its peer's Unix datagram sockets via the auxiliary data mechanism of
      recvmsg.
      
      Patch purpose:
      
      This patch enables a security-aware application to retrieve the
      security context of the peer of a Unix datagram socket.  The application
      can then use this security context to determine the security context for
      processing on behalf of the peer who sent the packet.
      
      Patch design and implementation:
      
      The design and implementation is very similar to the UDP case for INET
      sockets.  Basically we build upon the existing Unix domain socket API for
      retrieving user credentials.  Linux offers the API for obtaining user
      credentials via ancillary messages (i.e., out of band/control messages
      that are bundled together with a normal message).  To retrieve the security
      context, the application first indicates to the kernel such desire by
      setting the SO_PASSSEC option via getsockopt.  Then the application
      retrieves the security context using the auxiliary data mechanism.
      
      An example server application for Unix datagram socket should look like this:
      
      toggle = 1;
      toggle_len = sizeof(toggle);
      
      setsockopt(sockfd, SOL_SOCKET, SO_PASSSEC, &toggle, &toggle_len);
      recvmsg(sockfd, &msg_hdr, 0);
      if (msg_hdr.msg_controllen > sizeof(struct cmsghdr)) {
          cmsg_hdr = CMSG_FIRSTHDR(&msg_hdr);
          if (cmsg_hdr->cmsg_len <= CMSG_LEN(sizeof(scontext)) &&
              cmsg_hdr->cmsg_level == SOL_SOCKET &&
              cmsg_hdr->cmsg_type == SCM_SECURITY) {
              memcpy(&scontext, CMSG_DATA(cmsg_hdr), sizeof(scontext));
          }
      }
      
      sock_setsockopt is enhanced with a new socket option SOCK_PASSSEC to allow
      a server socket to receive security context of the peer.
      
      Testing:
      
      We have tested the patch by setting up Unix datagram client and server
      applications.  We verified that the server can retrieve the security context
      using the auxiliary data mechanism of recvmsg.
      Signed-off-by: NCatherine Zhang <cxzhang@watson.ibm.com>
      Acked-by: NAcked-by: James Morris <jmorris@namei.org>
      Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      877ce7c1
  15. 29 6月, 2006 1 次提交
    • C
      [S390] rework of channel measurement facility. · 94bb0633
      Cornelia Huck 提交于
      Fixes for several channel measurement facility bugs:
      * Blocks copied from the hardware might not be consistent. Solve this
        by moving the copying into idle state and repeating the copying.
      * avg_sample_interval changed with every read, even though no new block
        was available. Solve this by storing a timestamp when the last new
        block was received.
      * Several locking issues.
      * Measurements were not reenabled after a disconnected device became
        available again.
      * Remove #defines for ioctls that were never implemented.
      Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com>
      Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
      94bb0633