1. 01 Jul, 2011 2 commits
    • Avi Kivity's avatar
      perf: Add context field to perf_event · 4dc0da86
      Avi Kivity authored
      The perf_event overflow handler does not receive any caller-derived
      argument, so many callers need to resort to looking up the perf_event
      in their local data structure.  This is ugly and doesn't scale if a
      single callback services many perf_events.
      Fix by adding a context parameter to perf_event_create_kernel_counter()
      (and derived hardware breakpoints APIs) and storing it in the perf_event.
      The field can be accessed from the callback as event->overflow_handler_context.
      All callers are updated.
      Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Link: http://lkml.kernel.org/r/1309362157-6596-2-git-send-email-avi@redhat.comSigned-off-by: default avatarIngo Molnar <mingo@elte.hu>
    • Peter Zijlstra's avatar
      perf: Remove the nmi parameter from the swevent and overflow interface · a8b0ca17
      Peter Zijlstra authored
      The nmi parameter indicated if we could do wakeups from the current
      context, if not, we would set some state and self-IPI and let the
      resulting interrupt do the wakeup.
      For the various event classes:
        - hardware: nmi=0; PMI is in fact an NMI or we run irq_work_run from
          the PMI-tail (ARM etc.)
        - tracepoint: nmi=0; since tracepoint could be from NMI context.
        - software: nmi=[0,1]; some, like the schedule thing cannot
          perform wakeups, and hence need 0.
      As one can see, there is very little nmi=1 usage, and the down-side of
      not using it is that on some platforms some software events can have a
      jiffy delay in wakeup (when arch_irq_work_raise isn't implemented).
      The up-side however is that we can remove the nmi parameter and save a
      bunch of conditionals in fast paths.
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Michael Cree <mcree@orcon.net.nz>
      Cc: Will Deacon <will.deacon@arm.com>
      Cc: Deng-Cheng Zhu <dengcheng.zhu@gmail.com>
      Cc: Anton Blanchard <anton@samba.org>
      Cc: Eric B Munson <emunson@mgebm.net>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: David S. Miller <davem@davemloft.net>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Jason Wessel <jason.wessel@windriver.com>
      Cc: Don Zickus <dzickus@redhat.com>
      Link: http://lkml.kernel.org/n/tip-agjev8eu666tvknpb3iaj0fg@git.kernel.orgSigned-off-by: default avatarIngo Molnar <mingo@elte.hu>
  2. 31 Mar, 2011 1 commit
  3. 27 Feb, 2010 1 commit
    • Tejun Heo's avatar
      percpu: Add __percpu sparse annotations to hw_breakpoint · 44ee6358
      Tejun Heo authored
      Add __percpu sparse annotations to hw_breakpoint.
      These annotations are to make sparse consider percpu variables to be
      in a different address space and warn if accessed without going
      through percpu accessors.  This patch doesn't affect normal builds.
      In kernel/hw_breakpoint.c, per_cpu(nr_task_bp_pinned, cpu)'s will
      trigger spurious noderef related warnings from sparse.  Changing it to
      &per_cpu(nr_task_bp_pinned[0], cpu) will work around the problem but
      deemed to ugly by the maintainer.  Leave it alone until better
      solution can be found.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Cc: Stephen Rothwell <sfr@canb.auug.org.au>
      Cc: K.Prasad <prasad@linux.vnet.ibm.com>
      LKML-Reference: <4B7B4B7A.9050902@kernel.org>
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
  4. 06 Dec, 2009 1 commit
  5. 27 Nov, 2009 1 commit
  6. 26 Nov, 2009 1 commit
    • Frederic Weisbecker's avatar
      hw-breakpoints: Simplify error handling in breakpoint creation requests · 605bfaee
      Frederic Weisbecker authored
      This simplifies the error handling when we create a breakpoint.
      We don't need to check the NULL return value corner case anymore
      since we have improved perf_event_create_kernel_counter() to
      always return an error code in the failure case.
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Prasad <prasad@linux.vnet.ibm.com>
      LKML-Reference: <1259210142-5714-3-git-send-regression-fweisbec@gmail.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
  7. 23 Nov, 2009 1 commit
  8. 10 Nov, 2009 1 commit
  9. 02 Jun, 2009 1 commit