- 15 May, 2009 14 commits
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Peter Zijlstra authored
Instead of a per-process mlock gift for perf-counters, use a per-user gift so that there is less of a DoS potential. [ Impact: allow less worst-case unprivileged memory consumption ] Signed-off-by:
Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> LKML-Reference: <20090515132018.496182835@chello.nl> Signed-off-by:
Ingo Molnar <mingo@elte.hu>
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Peter Zijlstra authored
Now that ACPI idle doesn't use it anymore, remove the exports. [ Impact: remove dead code/data ] Signed-off-by:
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Ingo Molnar authored
Before this change, if a long-running perf stat workload was Ctrl-C-ed, the utility exited without displaying statistics. After the change, the Ctrl-C gets propagated into the workload (and causes its early exit there), but perf stat itself will still continue to run and will display counter results. This is useful to run open-ended workloads, let them run for a while, then Ctrl-C them to get the stats. [ Impact: extend perf stat with new functionality ] Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> LKML-Reference: <new-submission> Signed-off-by: -
Ingo Molnar authored
We had a disable/enable around acpi_idle_do_entry() due to an erratum in an early prototype CPU i had access to. That erratum has been fixed in the BIOS so remove the quirk. The quirk also kept us from profiling interrupts that hit the ACPI idle instruction - so this is an improvement as well, beyond a cleanup and a micro-optimization. [ Impact: improve profiling scope, cleanup, micro-optimization ] Signed-off-by:
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Ingo Molnar authored
intel_pmu_handle_irq() can lock up in an infinite loop if the hardware does not allow the acking of irqs. Alas, this happened in testing so make this robust and emit a warning if it happens in the future. Also, clean up the IRQ handlers a bit. [ Impact: improve perfcounter irq/nmi handling robustness ] Acked-by:
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Ingo Molnar authored
On certain CPUs i have observed a stuck PMU if interval was set to 1 and NMIs were used. The PMU had PMC0 set in MSR_CORE_PERF_GLOBAL_STATUS, but it was not possible to ack it via MSR_CORE_PERF_GLOBAL_OVF_CTRL, and the NMI loop got stuck infinitely. [ Impact: fix rare hangs during high perfcounter load ] Signed-off-by:
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Peter Zijlstra authored
Two consecutive NMIs could daze and confuse the machine when the first would handle the overflow of both counters. [ Impact: fix false-positive syslog messages under multi-session profiling ] Signed-off-by:
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Peter Zijlstra authored
The current disable/enable mechanism is: token = hw_perf_save_disable(); ... /* do bits */ ... hw_perf_restore(token); This works well, provided that the use nests properly. Except we don't. x86 NMI/INT throttling has non-nested use of this, breaking things. Therefore provide a reference counter disable/enable interface, where the first disable disables the hardware, and the last enable enables the hardware again. [ Impact: refactor, simplify the PMU disable/enable logic ] Signed-off-by:
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Peter Zijlstra authored
perf_counter_unthrottle() restores throttle_ctrl, buts its never set. Also, we fail to disable all counters when throttling. [ Impact: fix rare stuck perf-counters when they are throttled ] Signed-off-by:
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Peter Zijlstra authored
The simple reservation test in perf_output_copy() failed to take unsigned int overflow into account, fix this. [ Impact: fix false positive warning with more than 4GB of profiling data ] Signed-off-by:
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Peter Zijlstra authored
Apply sysctl_perf_counter_priv to NMIs. Also, fail the counter creation instead of silently down-grading to regular interrupts. [ Impact: allow wider perf-counter usage ] Signed-off-by:
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Ingo Molnar authored
If counters are disabled globally when a perfcounter IRQ/NMI hits, and if we throttle in that case, we'll promote the '0' value to the next lapic IRQ and disable all perfcounters at that point, permanently ... Fix it. [ Impact: fix hung perfcounters under load ] Acked-by:
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Peter Zijlstra authored
Take the counter width into account instead of assuming 32 bits. In particular Nehalem has 44 bit wide counters, and all arithmetics should happen on a 44-bit signed integer basis. [ Impact: fix rare event imprecision, warning message on Nehalem ] Signed-off-by:
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Arnaldo Carvalho de Melo authored
Allow specifying a pid instead of always fork+exec'ing a command. Because the PERF_EVENT_COMM and PERF_EVENT_MMAP events happened before we connected, we must synthesize them so that 'perf report' can get what it needs. [ Impact: add new command line option ] Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Clark Williams <williams@redhat.com> Cc: John Kacur <jkacur@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> LKML-Reference: <20090515015046.GA13664@ghostprotocols.net> Signed-off-by:
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- 13 May, 2009 1 commit
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Peter Zijlstra authored
inconsistent {IN-HARDIRQ-W} -> {HARDIRQ-ON-W} usage. bash/15802 [HC0[0]:SC0[0]:HE1:SE1] takes: (sysrq_key_table_lock){?.....}, Don't unconditionally enable interrupts in the perf_counter_print_debug() path. [ Impact: fix potential deadlock pointed out by lockdep ] LKML-Reference: <new-submission> Reported-by:
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- 12 May, 2009 1 commit
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Paul Mackerras authored
I noticed that when enabling a group via the PERF_COUNTER_IOC_ENABLE ioctl on the group leader, the counters weren't enabled and counting immediately on return from the ioctl, but did start counting a little while later (presumably after a context switch). The reason was that __perf_counter_enable calls group_sched_in which calls hw_perf_group_sched_in, which on powerpc assumes that the caller has called hw_perf_save_disable already. Until commit 46d686c6 ("perf_counter: put whole group on when enabling group leader") it was true that all callers of group_sched_in had called hw_perf_save_disable first, and the powerpc hw_perf_group_sched_in relies on that (there isn't an x86 version). This fixes the problem by putting calls to hw_perf_save_disable / hw_perf_restore around the calls to group_sched_in and counter_sched_in in __perf_counter_enable. Having the calls to hw_perf_save_disable/restore around the counter_sched_in call is harmless and makes this call consistent with the other call sites of counter_sched_in, which have all called hw_perf_save_disable first. [ Impact: more precise counter group disable/enable functionality ] Signed-off-by:Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> LKML-Reference: <18953.25733.53359.147452@cargo.ozlabs.ibm.com> Signed-off-by:
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- 11 May, 2009 4 commits
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Paul Mackerras authored
A compile warning triggered because we are calling atomic_set(&counter->count). But since counter->count is an atomic64_t, we have to use atomic64_set. So the count can be set short, resulting in the reset ioctl only resetting the low word. [ Impact: clear counter properly during the reset ioctl ] Signed-off-by:
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Paul Mackerras authored
The context-switch software counter gives inflated values at present because each scheduler tick and each process-wide counter enable/disable prctl gets counted as a context switch. This happens because perf_counter_task_tick, perf_counter_task_disable and perf_counter_task_enable all call perf_counter_task_sched_out, which calls perf_swcounter_event to record a context switch event. This fixes it by introducing a variant of perf_counter_task_sched_out with two underscores in front for internal use within the perf_counter code, and makes perf_counter_task_{tick,disable,enable} call it. This variant doesn't record a context switch event, and takes a struct perf_counter_context *. This adds the new variant rather than changing the behaviour or interface of perf_counter_task_sched_out because that is called from other code. [ Impact: fix inflated context-switch event counts ] Signed-off-by: -
Paul Mackerras authored
Currently, if you have a group where the leader is disabled and there are siblings that are enabled, and then you enable the leader, we only put the leader on the PMU, and not its enabled siblings. This is incorrect, since the enabled group members should be all on or all off at any given point. This fixes it by adding a call to group_sched_in in __perf_counter_enable in the case where we're enabling a group leader. To avoid the need for a forward declaration this also moves group_sched_in up before __perf_counter_enable. The actual content of group_sched_in is unchanged by this patch. [ Impact: fix bug in counter enable code ] Signed-off-by:
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Mike Galbraith authored
s/PERFMON/perfcounters for perfcounter interrupt throttling warning. 'perfmon' is the CPU feature name that is Intel-only, while we do throttling in a generic way. [ Impact: cleanup ] Signed-off-by:
Mike Galbraith <efault@gmx.de> Cc: Robert Richter <robert.richter@amd.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <new-submission> Signed-off-by:
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- 10 May, 2009 1 commit
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Erdem Aktas authored
There is a buffer overwrite problem in builtin-top.c line 526, When I tried to use ./perf top command, it was giving memory corruption problem. [ Impact: fix 'perf top' crash ] LKML-Reference: <3fee128b0905092313x608e65e0l7b1116d86914114f@mail.gmail.com> Signed-off-by:
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- 09 May, 2009 1 commit
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Ingo Molnar authored
Signed-off-by:
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- 08 May, 2009 4 commits
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Peter Zijlstra authored
Allow recording the CPU number the event was generated on. RFC: this leaves a u32 as reserved, should we fill in the node_id() there, or leave this open for future extention, as userspace can already easily do the cpu->node mapping if needed. [ Impact: extend perfcounter output record format ] Signed-off-by: -
Peter Zijlstra authored
Much like CONFIG_RECORD_GROUP records the hw_event.config to identify the values, allow to record this for all counters. [ Impact: extend perfcounter output record format ] Signed-off-by:
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Peter Zijlstra authored
Corey noticed that ioctl()s on grouped counters didn't work on the whole group. This extends the ioctl() interface to take a second argument that is interpreted as a flags field. We then provide PERF_IOC_FLAG_GROUP to toggle the behaviour. Having this flag gives the greatest flexibility, allowing you to individually enable/disable/reset counters in a group, or all together. [ Impact: fix group counter enable/disable semantics ] Reported-by:
Corey Ashford <cjashfor@linux.vnet.ibm.com> Signed-off-by:
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Peter Zijlstra authored
perf_counter_task_tick() does way too much work to find out there's nothing to do. Provide an easy short-circuit for the normal case where there are no counters on the system. [ Impact: micro-optimization ] Signed-off-by:
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- 06 May, 2009 1 commit
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Ingo Molnar authored
Merge reason: we moved a mutex.h commit that originated from the perfcounters tree into core/locking - but now merge back that branch to solve a merge artifact and to pick up cleanups of this commit that happened in core/locking. Signed-off-by:
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- 05 May, 2009 6 commits
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Peter Zijlstra authored
"perf record": - per task counter - inherit switch - nmi switch "perf report": - userspace/kernel filter "perf stat": - userspace/kernel filter Signed-off-by:
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Peter Zijlstra authored
Redirect the output to the parent counter and put in some sanity checks. [ Impact: new perfcounter feature - inherited sampling counters ] Signed-off-by:
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Peter Zijlstra authored
Use -1 instead of 0 as unlocked, since 0 is a valid cpu number. ( This is not an issue right now but will be once we allow multiple counters to output to the same mmap area. ) [ Impact: prepare code for multi-counter profile output ] Signed-off-by:
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Peter Zijlstra authored
Provide a threshold to relax the mlock accounting, increasing usability. Each counter gets perf_counter_mlock_kb for free. [ Impact: allow more mmap buffering ] Signed-off-by:
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Peter Zijlstra authored
Provide a way to reset an existing counter - this eases PAPI libraries around perfcounters. Similar to read() it doesn't collapse pending child counters. [ Impact: new perfcounter fd ioctl method to reset counters ] Suggested-by:
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Peter Zijlstra authored
Keep data_head up-to-date irrespective of notifications. This fixes the case where you disable a counter and don't get a notification for the last few pending events, and it also allows polling usage. [ Impact: increase precision of perfcounter mmap-ed fields ] Suggested-by:
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- 04 May, 2009 5 commits
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Ingo Molnar authored
Fixed-purpose counters stopped working in a simple 'perf stat ls' run: <not counted> cache references <not counted> cache misses Due to: ef7b3e09: perf_counter, x86: remove vendor check in fixed_mode_idx() Which made x86_pmu.num_counters_fixed matter: if it's nonzero, the fixed-purpose counters are utilized. But on v2 perfmon this field is not set (despite there being fixed-purpose PMCs). So add a quirk to set the number of fixed-purpose counters to at least three. [ Impact: add quirk for three fixed-purpose counters on certain Intel CPUs ] Cc: Robert Richter <robert.richter@amd.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <1241002046-8832-28-git-send-email-robert.richter@amd.com> Signed-off-by:
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Ingo Molnar authored
Now percpu counters can be initialized very early. But the init sequence uses mutex_lock(). Fortunately, perf_resource_mutex should be a spinlock anyway, so convert it. [ Impact: fix crash due to early init mutex use ] LKML-Reference: <new-submission> Signed-off-by: -
Ingo Molnar authored
percpu scheduling for perfcounters wants to take the context lock, but that lock first needs to be initialized. Currently it is an early_initcall() - but that is too late, the task tick runs much sooner than that. Call it explicitly from the scheduler init sequence instead. [ Impact: fix access-before-init crash ] LKML-Reference: <new-submission> Signed-off-by: -
Peter Zijlstra authored
Invert the atomic_inc_not_zero() test so that we will indeed detect the first activation. Also rename the global num_counters, since its easy to confuse with x86_pmu.num_counters. [ Impact: fix non-working perfcounters on AMD CPUs, cleanup ] Signed-off-by:
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Ingo Molnar authored
This used to be unstable when we had the rq->lock dependencies, but now that they are that of the past we can turn on percpu counter RR too. [ Impact: handle counter over-commit for per-CPU counters too ] LKML-Reference: <new-submission> Signed-off-by:
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- 03 May, 2009 1 commit
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Mike Galbraith authored
ctype.h crawled out of the bit bucket :) Signed-off-by:
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- 01 May, 2009 1 commit
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Thomas Gleixner authored
Avoid further confusion during development Signed-off-by:Thomas Gleixner <tglx@linutronix.de>
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