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| * | perf: Change close() semantics for group eventsPeter Zijlstra2011-05-281-7/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In order to always call list_del_event() on the correct cpu if the event is part of an active context and avoid having to do two IPIs, change the close() semantics slightly. The current perf_event_disable() call would disable a whole group if the event that's being closed is the group leader, whereas the new code keeps the group siblings enabled. People should not rely on this behaviour and I don't think they do, but in case we find they do, the fix is easy and we have to take the double IPI cost. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Vince Weaver <vweaver1@eecs.utk.edu> Link: http://lkml.kernel.org/r/20110409192142.038377551@chello.nl Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | perf: Collect the schedule-in rules in one functionPeter Zijlstra2011-05-281-12/+15
| | | | | | | | | | | | | | | | | | | | | | | | | | | This was scattered out - refactor it into a single function. No change in functionality. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/20110409192141.979862055@chello.nl Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | perf: Change and simplify ctx::is_active semanticsPeter Zijlstra2011-05-281-6/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Instead of tracking if a context is active or not, track which events of the context are active. By making it a bitmask of EVENT_PINNED|EVENT_FLEXIBLE we can simplify some of the scheduling routines since it can avoid adding events that are already active. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/20110409192141.930282378@chello.nl Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | perf: Simplify and fix __perf_install_in_context()Peter Zijlstra2011-05-281-45/+35
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently __perf_install_in_context() will try and schedule in the event irrespective of our event scheduling rules, that is, we try to schedule CPU-pinned, TASK-pinned, CPU-flexible, TASK-flexible, but when creating a new event we simply try and schedule it on top of whatever is already on the PMU, this can lead to errors for pinned events. Therefore, simplify things and simply schedule everything out, add the event to the corresponding context and schedule everything back in. This also nicely handles the case where with __ARCH_WANT_INTERRUPTS_ON_CTXSW the IPI can come right in the middle of schedule, before we managed to call perf_event_task_sched_in(). Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/20110409192141.870894224@chello.nl Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | perf: Remove task_ctx_sched_in()Peter Zijlstra2011-05-281-20/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Make task_ctx_sched_*() imply EVENT_ALL, since anything less will not actually have scheduled the task in/out at all. Since there's no site that schedules all of a task in (due to the interleave with flexible cpuctx) we can remove this function. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/20110409192141.817893268@chello.nl Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | perf: Optimize event scheduling lockingPeter Zijlstra2011-05-281-25/+36
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently we only hold one ctx->lock at a time, which results in us flipping back and forth between cpuctx->ctx.lock and task_ctx->lock. Avoid this and gain large atomic regions by holding both locks. We nest the task lock inside the cpu lock, since with task scheduling we might have to change task ctx while holding the cpu ctx lock. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/20110409192141.769881865@chello.nl Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | perf: Clean up 'ctx' reference countingPeter Zijlstra2011-05-281-7/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | Small cleanup to how we refcount in find_get_context(), this also allows us to use put_ctx() to free things instead of using kfree(). Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/20110409192141.719340481@chello.nl Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | perf: Optimize ctx_sched_out()Peter Zijlstra2011-05-281-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Oleg noted that ctx_sched_out() disables the PMU even though it might not actually do something, avoid needless PMU-disabling. Reported-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/20110409192141.665385503@chello.nl Signed-off-by: Ingo Molnar <mingo@elte.hu>
* | | merged 3.0.101 tagWolfgang Wiedmeyer2015-10-222-19/+64
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* | | perf: Treat attr.config as u64 in perf_swevent_init()Tommi Rantala2013-06-121-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Trinity discovered that we fail to check all 64 bits of attr.config passed by user space, resulting to out-of-bounds access of the perf_swevent_enabled array in sw_perf_event_destroy(). Introduced in commit b0a873ebb ("perf: Register PMU implementations"). Change-Id: I1c88a37754c4ab7044f2df96916d874f807a5068 Signed-off-by: Tommi Rantala <tt.rantala@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: davej@redhat.com Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net> Link: http://lkml.kernel.org/r/1365882554-30259-1-git-send-email-tt.rantala@gmail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
* | | perf_event: Switch to internal refcount, fix race with close()Al Viro2012-10-021-29/+33
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | commit a6fa941d94b411bbd2b6421ffbde6db3c93e65ab upstream. Don't mess with file refcounts (or keep a reference to file, for that matter) in perf_event. Use explicit refcount of its own instead. Deal with the race between the final reference to event going away and new children getting created for it by use of atomic_long_inc_not_zero() in inherit_event(); just have the latter free what it had allocated and return NULL, that works out just fine (children of siblings of something doomed are created as singletons, same as if the child of leader had been created and immediately killed). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/20120820135925.GG23464@ZenIV.linux.org.uk Signed-off-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* | | perf: Fix software event overflowPeter Zijlstra2011-08-041-5/+2
| |/ |/| | | | | | | | | | | | | | | | | | | | | | | | | The below patch is for -stable only, upstream has a much larger patch that contains the below hunk in commit a8b0ca17b80e92faab46ee7179ba9e99ccb61233 Vince found that under certain circumstances software event overflows go wrong and deadlock. Avoid trying to delete a timer from the timer callback. Reported-by: Vince Weaver <vweaver1@eecs.utk.edu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* | Merge branch 'perf/urgent' of ↵Ingo Molnar2011-06-041-0/+8
|\ \ | |/ | | | | git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/urgent
| * perf: Fix SIGIO handlingPeter Zijlstra2011-05-281-0/+8
| | | | | | | | | | | | | | | | | | | | | | Vince noticed that unless we mmap() a buffer, SIGIO gets lost. So explicitly push the wakeup (including signals) when requested. Reported-by: Vince Weaver <vweaver1@eecs.utk.edu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: <stable@kernel.org> Link: http://lkml.kernel.org/n/tip-2euus3f3x3dyvdk52cjxw8zu@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
* | perf, cgroups: Fix up for new APIPeter Zijlstra2011-05-311-18/+4
|/ | | | | | | | | | | | | | Ben changed the cgroup API in commit f780bdb7c1c (cgroups: add per-thread subsystem callbacks) in an incompatible way, but forgot to convert the perf cgroup bits. Avoid compile warnings and runtime splats and convert perf too ;-) Acked-by: Ben Blum <bblum@andrew.cmu.edu> Cc: Stephane Eranian <eranian@google.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1306767651.1200.2990.camel@twins Signed-off-by: Ingo Molnar <mingo@elte.hu>
* Merge branch 'core-rcu-for-linus' of ↵Linus Torvalds2011-05-191-18/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (78 commits) Revert "rcu: Decrease memory-barrier usage based on semi-formal proof" net,rcu: convert call_rcu(prl_entry_destroy_rcu) to kfree batman,rcu: convert call_rcu(softif_neigh_free_rcu) to kfree_rcu batman,rcu: convert call_rcu(neigh_node_free_rcu) to kfree() batman,rcu: convert call_rcu(gw_node_free_rcu) to kfree_rcu net,rcu: convert call_rcu(kfree_tid_tx) to kfree_rcu() net,rcu: convert call_rcu(xt_osf_finger_free_rcu) to kfree_rcu() net/mac80211,rcu: convert call_rcu(work_free_rcu) to kfree_rcu() net,rcu: convert call_rcu(wq_free_rcu) to kfree_rcu() net,rcu: convert call_rcu(phonet_device_rcu_free) to kfree_rcu() perf,rcu: convert call_rcu(swevent_hlist_release_rcu) to kfree_rcu() perf,rcu: convert call_rcu(free_ctx) to kfree_rcu() net,rcu: convert call_rcu(__nf_ct_ext_free_rcu) to kfree_rcu() net,rcu: convert call_rcu(net_generic_release) to kfree_rcu() net,rcu: convert call_rcu(netlbl_unlhsh_free_addr6) to kfree_rcu() net,rcu: convert call_rcu(netlbl_unlhsh_free_addr4) to kfree_rcu() security,rcu: convert call_rcu(sel_netif_free) to kfree_rcu() net,rcu: convert call_rcu(xps_dev_maps_release) to kfree_rcu() net,rcu: convert call_rcu(xps_map_release) to kfree_rcu() net,rcu: convert call_rcu(rps_map_release) to kfree_rcu() ...
* perf events: Clean up definitions and initializers, update copyrightsIngo Molnar2011-05-041-20/+20
| | | | | | | | | Fix a few inconsistent style bits that were added over the past few months. Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/n/tip-yv4hwf9yhnzoada8pcpb3a97@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
* hw breakpoints: Move to kernel/events/Borislav Petkov2011-05-032-1/+661
| | | | | | | | As part of the events sybsystem unification, relocate hw_breakpoint.c into its new destination. Cc: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
* perf: Start the restructuringBorislav Petkov2011-05-032-0/+7460
mv kernel/perf_event.c -> kernel/events/core.c. From there, all further sensible splitting can happen. The idea is that due to perf_event.c becoming pretty sizable and with the advent of the marriage with ftrace, splitting functionality into its logical parts should help speeding up the unification and to manage the complexity of the subsystem. Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
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