1. 29 Oct, 2014 1 commit
  2. 09 Aug, 2014 2 commits
  3. 18 Jul, 2014 2 commits
  4. 23 Apr, 2014 1 commit
  5. 13 Jan, 2014 1 commit
    • Dario Faggioli's avatar
      sched: Add new scheduler syscalls to support an extended scheduling parameters ABI · d50dde5a
      Dario Faggioli authored
      
      
      Add the syscalls needed for supporting scheduling algorithms
      with extended scheduling parameters (e.g., SCHED_DEADLINE).
      
      In general, it makes possible to specify a periodic/sporadic task,
      that executes for a given amount of runtime at each instance, and is
      scheduled according to the urgency of their own timing constraints,
      i.e.:
      
       - a (maximum/typical) instance execution time,
       - a minimum interval between consecutive instances,
       - a time constraint by which each instance must be completed.
      
      Thus, both the data structure that holds the scheduling parameters of
      the tasks and the system calls dealing with it must be extended.
      Unfortunately, modifying the existing struct sched_param would break
      the ABI and result in potentially serious compatibility issues with
      legacy binaries.
      
      For these reasons, this patch:
      
       - defines the new struct sched_attr, containing all the fields
         that are necessary for specifying a task in the computational
         model described above;
      
       - defines and implements the new scheduling related syscalls that
         manipulate it, i.e., sched_setattr() and sched_getattr().
      
      Syscalls are introduced for x86 (32 and 64 bits) and ARM only, as a
      proof of concept and for developing and testing purposes. Making them
      available on other architectures is straightforward.
      
      Since no "user" for these new parameters is introduced in this patch,
      the implementation of the new system calls is just identical to their
      already existing counterpart. Future patches that implement scheduling
      policies able to exploit the new data structure must also take care of
      modifying the sched_*attr() calls accordingly with their own purposes.
      Signed-off-by: default avatarDario Faggioli <raistlin@linux.it>
      [ Rewrote to use sched_attr. ]
      Signed-off-by: default avatarJuri Lelli <juri.lelli@gmail.com>
      [ Removed sched_setscheduler2() for now. ]
      Signed-off-by: default avatarPeter Zijlstra <peterz@infradead.org>
      Link: http://lkml.kernel.org/r/1383831828-15501-3-git-send-email-juri.lelli@gmail.com
      
      Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
      d50dde5a
  6. 03 Mar, 2013 1 commit
  7. 14 Dec, 2012 1 commit
  8. 12 Oct, 2012 1 commit
  9. 01 Oct, 2012 2 commits
  10. 21 Sep, 2012 1 commit
  11. 19 Sep, 2012 1 commit
  12. 31 Jul, 2012 1 commit
  13. 13 Dec, 2011 1 commit
  14. 17 Nov, 2011 1 commit
  15. 17 Sep, 2011 1 commit
    • Russell King's avatar
      ARM: nommu: fix warning with checksyscalls.sh · 4dfa3386
      Russell King authored
      
      
        CALL    scripts/checksyscalls.sh
      <stdin>:46:1: warning: "__IGNORE_migrate_pages" redefined
      In file included from <stdin>:2:
      arch/arm/include/asm/unistd.h:482:1: warning: this is the location of the previous definition
      
      This is caused because we define __IGNORE_migrate_pages to be 1, but
      in the case of nommu, it's defined to be empty.  Fix this by just
      defining the __IGNORE_ symbols to be empty.
      Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
      4dfa3386
  16. 28 May, 2011 1 commit
    • Eric W. Biederman's avatar
      ns: Wire up the setns system call · 7b21fddd
      Eric W. Biederman authored
      
      
      32bit and 64bit on x86 are tested and working.  The rest I have looked
      at closely and I can't find any problems.
      
      setns is an easy system call to wire up.  It just takes two ints so I
      don't expect any weird architecture porting problems.
      
      While doing this I have noticed that we have some architectures that are
      very slow to get new system calls.  cris seems to be the slowest where
      the last system calls wired up were preadv and pwritev.  avr32 is weird
      in that recvmmsg was wired up but never declared in unistd.h.  frv is
      behind with perf_event_open being the last syscall wired up.  On h8300
      the last system call wired up was epoll_wait.  On m32r the last system
      call wired up was fallocate.  mn10300 has recvmmsg as the last system
      call wired up.  The rest seem to at least have syncfs wired up which was
      new in the 2.6.39.
      
      v2: Most of the architecture support added by Daniel Lezcano <dlezcano@fr.ibm.com>
      v3: ported to v2.6.36-rc4 by: Eric W. Biederman <ebiederm@xmission.com>
      v4: Moved wiring up of the system call to another patch
      v5: ported to v2.6.39-rc6
      v6: rebased onto parisc-next and net-next to avoid syscall  conflicts.
      v7: ported to Linus's latest post 2.6.39 tree.
      
      >  arch/blackfin/include/asm/unistd.h     |    3 ++-
      >  arch/blackfin/mach-common/entry.S      |    1 +
      Acked-by: default avatarMike Frysinger <vapier@gentoo.org>
      
      Oh - ia64 wiring looks good.
      Acked-by: default avatarTony Luck <tony.luck@intel.com>
      Signed-off-by: default avatarEric W. Biederman <ebiederm@xmission.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      7b21fddd
  17. 26 May, 2011 1 commit
  18. 15 Apr, 2011 1 commit
  19. 01 Sep, 2010 1 commit
  20. 15 Aug, 2010 1 commit
    • Mikael Pettersson's avatar
      ARM: 6329/1: wire up sys_accept4() on ARM · 21d93e2e
      Mikael Pettersson authored
      
      
      sys_accept4() was added in kernel 2.6.28, but ARM was not updated
      to include it.  The number and types of parameters is such that
      no ARM-specific processing is needed, so wiring up sys_accept4()
      just requires defining __NR_accept4 and adding a direct call in
      the syscall entry table.
      
      Tested with an EABI 2.6.35 kernel and Ulrich Drepper's original
      accept4() test program, modified to define __NR_accept4 for ARM.
      
      Using the updated unistd.h also eliminates a warning then building
      glibc (2.10.2 and newer) about accept4() being unimplemented.
      Signed-off-by: default avatarMikael Pettersson <mikpe@it.uu.se>
      Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
      21d93e2e
  21. 12 Mar, 2010 3 commits
  22. 07 Jan, 2010 1 commit
  23. 10 Nov, 2009 1 commit
  24. 28 Sep, 2009 1 commit
  25. 21 Sep, 2009 1 commit
    • Ingo Molnar's avatar
      perf: Do the big rename: Performance Counters -> Performance Events · cdd6c482
      Ingo Molnar authored
      
      
      Bye-bye Performance Counters, welcome Performance Events!
      
      In the past few months the perfcounters subsystem has grown out its
      initial role of counting hardware events, and has become (and is
      becoming) a much broader generic event enumeration, reporting, logging,
      monitoring, analysis facility.
      
      Naming its core object 'perf_counter' and naming the subsystem
      'perfcounters' has become more and more of a misnomer. With pending
      code like hw-breakpoints support the 'counter' name is less and
      less appropriate.
      
      All in one, we've decided to rename the subsystem to 'performance
      events' and to propagate this rename through all fields, variables
      and API names. (in an ABI compatible fashion)
      
      The word 'event' is also a bit shorter than 'counter' - which makes
      it slightly more convenient to write/handle as well.
      
      Thanks goes to Stephane Eranian who first observed this misnomer and
      suggested a rename.
      
      User-space tooling and ABI compatibility is not affected - this patch
      should be function-invariant. (Also, defconfigs were not touched to
      keep the size down.)
      
      This patch has been generated via the following script:
      
        FILES=$(find * -type f | grep -vE 'oprofile|[^K]config')
      
        sed -i \
          -e 's/PERF_EVENT_/PERF_RECORD_/g' \
          -e 's/PERF_COUNTER/PERF_EVENT/g' \
          -e 's/perf_counter/perf_event/g' \
          -e 's/nb_counters/nb_events/g' \
          -e 's/swcounter/swevent/g' \
          -e 's/tpcounter_event/tp_event/g' \
          $FILES
      
        for N in $(find . -name perf_counter.[ch]); do
          M=$(echo $N | sed 's/perf_counter/perf_event/g')
          mv $N $M
        done
      
        FILES=$(find . -name perf_event.*)
      
        sed -i \
          -e 's/COUNTER_MASK/REG_MASK/g' \
          -e 's/COUNTER/EVENT/g' \
          -e 's/\<event\>/event_id/g' \
          -e 's/counter/event/g' \
          -e 's/Counter/Event/g' \
          $FILES
      
      ... to keep it as correct as possible. This script can also be
      used by anyone who has pending perfcounters patches - it converts
      a Linux kernel tree over to the new naming. We tried to time this
      change to the point in time where the amount of pending patches
      is the smallest: the end of the merge window.
      
      Namespace clashes were fixed up in a preparatory patch - and some
      stylistic fallout will be fixed up in a subsequent patch.
      
      ( NOTE: 'counters' are still the proper terminology when we deal
        with hardware registers - and these sed scripts are a bit
        over-eager in renaming them. I've undone some of that, but
        in case there's something left where 'counter' would be
        better than 'event' we can undo that on an individual basis
        instead of touching an otherwise nicely automated patch. )
      Suggested-by: default avatarStephane Eranian <eranian@google.com>
      Acked-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Acked-by: default avatarPaul Mackerras <paulus@samba.org>
      Reviewed-by: default avatarArjan van de Ven <arjan@linux.intel.com>
      Cc: Mike Galbraith <efault@gmx.de>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: David Howells <dhowells@redhat.com>
      Cc: Kyle McMartin <kyle@mcmartin.ca>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: <linux-arch@vger.kernel.org>
      LKML-Reference: <new-submission>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      cdd6c482
  26. 15 Aug, 2009 1 commit
    • Mikael Pettersson's avatar
      ARM: 5677/1: ARM support for TIF_RESTORE_SIGMASK/pselect6/ppoll/epoll_pwait · 36984265
      Mikael Pettersson authored
      
      
      This patch adds support for TIF_RESTORE_SIGMASK to ARM's
      signal handling, which allows to hook up the pselect6, ppoll,
      and epoll_pwait syscalls on ARM.
      
      Tested here with eabi userspace and a test program with a
      deliberate race between a child's exit and the parent's
      sigprocmask/select sequence. Using sys_pselect6() instead
      of sigprocmask/select reliably prevents the race.
      
      The other arch's support for TIF_RESTORE_SIGMASK has evolved
      over time:
      
      In 2.6.16:
      - add TIF_RESTORE_SIGMASK which parallels TIF_SIGPENDING
      - test both when checking for pending signal [changed later]
      - reimplement sys_sigsuspend() to use current->saved_sigmask,
        TIF_RESTORE_SIGMASK [changed later], and -ERESTARTNOHAND;
        ditto for sys_rt_sigsuspend(), but drop private code and
        use common code via __ARCH_WANT_SYS_RT_SIGSUSPEND;
      - there are now no "extra" calls to do_signal() so its oldset
        parameter is always &current->blocked so need not be passed,
        also its return value is changed to void
      - change handle_signal() to return 0/-errno
      - change do_signal() to honor TIF_RESTORE_SIGMASK:
        + get oldset from current->saved_sigmask if TIF_RESTORE_SIGMASK
          is set
        + if handle_signal() was successful then clear TIF_RESTORE_SIGMASK
        + if no signal was delivered and TIF_RESTORE_SIGMASK is set then
          clear it and restore the sigmask
      - hook up sys_pselect6() and sys_ppoll()
      
      In 2.6.19:
      - hook up sys_epoll_pwait()
      
      In 2.6.26:
      - allow archs to override how TIF_RESTORE_SIGMASK is implemented;
        default set_restore_sigmask() sets both TIF_RESTORE_SIGMASK and
        TIF_SIGPENDING; archs need now just test TIF_SIGPENDING again
        when checking for pending signal work; some archs now implement
        TIF_RESTORE_SIGMASK as a secondary/non-atomic thread flag bit
      - call set_restore_sigmask() in sys_sigsuspend() instead of setting
        TIF_RESTORE_SIGMASK
      
      In 2.6.29-rc:
      - kill sys_pselect7() which no arch wanted
      
      So for 2.6.31-rc6/ARM this patch does the following:
      - Add TIF_RESTORE_SIGMASK. Use the generic set_restore_sigmask()
        which sets both TIF_SIGPENDING and TIF_RESTORE_SIGMASK, so
        TIF_RESTORE_SIGMASK need not claim one of the scarce low thread
        flags, and existing TIF_SIGPENDING and _TIF_WORK_MASK tests need
        not be extended for TIF_RESTORE_SIGMASK.
      - sys_sigsuspend() is reimplemented to use current->saved_sigmask
        and set_restore_sigmask(), making it identical to most other archs
      - The private code for sys_rt_sigsuspend() is removed, instead
        generic code supplies it via __ARCH_WANT_SYS_RT_SIGSUSPEND.
      - sys_sigsuspend() and sys_rt_sigsuspend() no longer need a pt_regs
        parameter, so their assembly code wrappers are removed.
      - handle_signal() is changed to return 0 on success or -errno.
      - The oldset parameter to do_signal() is now redundant and removed,
        and the return value is now also redundant and changed to void.
      - do_signal() is changed to honor TIF_RESTORE_SIGMASK:
        + get oldset from current->saved_sigmask if TIF_RESTORE_SIGMASK
          is set
        + if handle_signal() was successful then clear TIF_RESTORE_SIGMASK
        + if no signal was delivered and TIF_RESTORE_SIGMASK is set then
          clear it and restore the sigmask
      - Hook up sys_pselect6, sys_ppoll, and sys_epoll_pwait.
      Signed-off-by: default avatarMikael Pettersson <mikpe@it.uu.se>
      Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
      36984265
  27. 20 Jun, 2009 1 commit
  28. 20 Apr, 2009 1 commit
    • Mikael Pettersson's avatar
      [ARM] 5456/1: add sys_preadv and sys_pwritev · eb8f3142
      Mikael Pettersson authored
      
      
      Kernel 2.6.30-rc1 added sys_preadv and sys_pwritev to most archs
      but not ARM, resulting in
      
      <stdin>:1421:2: warning: #warning syscall preadv not implemented
      <stdin>:1425:2: warning: #warning syscall pwritev not implemented
      
      This patch adds sys_preadv and sys_pwritev to ARM.
      
      These syscalls simply take five long-sized parameters, so they
      should have no calling-convention/ABI issues in the kernel.
      
      Tested on armv5tel eabi using a preadv/pwritev test program posted
      on linuxppc-dev earlier this month.
      
      It would be nice to get this into the kernel before 2.6.30 final,
      so that glibc's kernel version feature test for these syscalls
      doesn't have to special-case ARM.
      Signed-off-by: default avatarMikael Pettersson <mikpe@it.uu.se>
      Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
      eb8f3142
  29. 12 Aug, 2008 1 commit
  30. 02 Aug, 2008 1 commit
  31. 19 Apr, 2008 1 commit
  32. 12 Oct, 2007 1 commit
  33. 20 Jul, 2007 1 commit
  34. 28 Jun, 2007 1 commit
    • David Woodhouse's avatar
      Introduce fixed sys_sync_file_range2() syscall, implement on PowerPC and ARM · edd5cd4a
      David Woodhouse authored
      
      
      Not all the world is an i386.  Many architectures need 64-bit arguments to be
      aligned in suitable pairs of registers, and the original
      sys_sync_file_range(int, loff_t, loff_t, int) was therefore wasting an
      argument register for padding after the first integer.  Since we don't
      normally have more than 6 arguments for system calls, that left no room for
      the final argument on some architectures.
      
      Fix this by introducing sys_sync_file_range2(int, int, loff_t, loff_t) which
      all fits nicely.  In fact, ARM already had that, but called it
      sys_arm_sync_file_range.  Move it to fs/sync.c and rename it, then implement
      the needed compatibility routine.  And stop the missing syscall check from
      bitching about the absence of sys_sync_file_range() if we've implemented
      sys_sync_file_range2() instead.
      
      Tested on PPC32 and with 32-bit and 64-bit userspace on PPC64.
      Signed-off-by: default avatarDavid Woodhouse <dwmw2@infradead.org>
      Acked-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
      Cc: Arnd Bergmann <arnd@arndb.de>
      Cc: Paul Mackerras <paulus@samba.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      edd5cd4a
  35. 16 May, 2007 1 commit