- 06 4月, 2009 40 次提交
-
-
由 Peter Zijlstra 提交于
update kerneltop to use the mmap() output to gather overflow information Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: Paul Mackerras <paulus@samba.org> Orig-LKML-Reference: <20090323172417.677932499@chello.nl> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Peter Zijlstra 提交于
update the kerneltop userspace to work with the latest syscall ABI Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: Paul Mackerras <paulus@samba.org> Orig-LKML-Reference: <20090323172417.559643732@chello.nl> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Peter Zijlstra 提交于
Impact: Rework the perfcounter output ABI use sys_read() only for instant data and provide mmap() output for all async overflow data. The first mmap() determines the size of the output buffer. The mmap() size must be a PAGE_SIZE multiple of 1+pages, where pages must be a power of 2 or 0. Further mmap()s of the same fd must have the same size. Once all maps are gone, you can again mmap() with a new size. In case of 0 extra pages there is no data output and the first page only contains meta data. When there are data pages, a poll() event will be generated for each full page of data. Furthermore, the output is circular. This means that although 1 page is a valid configuration, its useless, since we'll start overwriting it the instant we report a full page. Future work will focus on the output format (currently maintained) where we'll likey want each entry denoted by a header which includes a type and length. Further future work will allow to splice() the fd, also containing the async overflow data -- splice() would be mutually exclusive with mmap() of the data. Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Orig-LKML-Reference: <20090323172417.470536358@chello.nl> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 H. Peter Anvin 提交于
Impact: build fix mutex_lock() is was defined inline in kernel/mutex.c, but wasn't declared so not in <linux/mutex.h>. This didn't cause a problem until checkin 3a2d367d9aabac486ac4444c6c7ec7a1dab16267 added the atomic_dec_and_mutex_lock() inline in between declaration and definion. This broke building with CONFIG_ALLOW_WARNINGS=n, e.g. make allnoconfig. Either from the source code nor the allnoconfig binary output I cannot find any internal references to mutex_lock() in kernel/mutex.c, so presumably this "inline" is now-useless legacy. Cc: Eric Paris <eparis@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Orig-LKML-Reference: <tip-3a2d367d9aabac486ac4444c6c7ec7a1dab16267@git.kernel.org> Signed-off-by: NH. Peter Anvin <hpa@linux.intel.com>
-
由 Eric Paris 提交于
Much like the atomic_dec_and_lock() function in which we take an hold a spin_lock if we drop the atomic to 0 this function takes and holds the mutex if we dec the atomic to 0. Signed-off-by: NEric Paris <eparis@redhat.com> Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Orig-LKML-Reference: <20090323172417.410913479@chello.nl> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Paul Mackerras 提交于
Impact: new feature giving performance improvement This adds the ability for userspace to do an mmap on a hardware counter fd and get access to a read-only page that contains the information needed to translate a hardware counter value to the full 64-bit counter value that would be returned by a read on the fd. This is useful on architectures that allow user programs to read the hardware counters, such as PowerPC. The mmap will only succeed if the counter is a hardware counter monitoring the current process. On my quad 2.5GHz PowerPC 970MP machine, userspace can read a counter and translate it to the full 64-bit value in about 30ns using the mmapped page, compared to about 830ns for the read syscall on the counter, so this does give a significant performance improvement. Signed-off-by: NPaul Mackerras <paulus@samba.org> Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Orig-LKML-Reference: <20090323172417.297057964@chello.nl> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Peter Zijlstra 提交于
Tracepoint events like lock_acquire and software counters like pagefaults can recurse into the perf counter code again, avoid that. Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Orig-LKML-Reference: <20090323172417.152096433@chello.nl> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Peter Zijlstra 提交于
Since the bitfields turned into a bit of a mess, remove them and rely on good old masks. Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Orig-LKML-Reference: <20090323172417.059499915@chello.nl> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Wu Fengguang 提交于
Signed-off-by: NWu Fengguang <fengguang.wu@intel.com> Acked-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Wu Fengguang 提交于
In my system, it takes kerneltop dozens of minutes to show up usable numbers. Make the default count 100 times smaller fixed this long startup latency. I'm not sure if it's the right solution though. Signed-off-by: NWu Fengguang <fengguang.wu@intel.com> Acked-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Wu Fengguang 提交于
Signed-off-by: NWu Fengguang <fengguang.wu@intel.com> Acked-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Wu Fengguang 提交于
Signed-off-by: NWu Fengguang <fengguang.wu@intel.com> Acked-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Wu Fengguang 提交于
- perfstat.c can be safely removed now - perfstat: -s => -a for system wide accounting - kerneltop: add -S/--stat for perfstat mode - minor adjustments to kerneltop --help, perfstat --help Signed-off-by: NWu Fengguang <fengguang.wu@intel.com> Acked-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Wu Fengguang 提交于
- can handle sw counters now - the outputs will look slightly different Acked-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Wu Fengguang 提交于
- kerneltop: --event_id => --event - kerneltop: can accept SW event types now - perfstat: it used to implicitly add event -2(task-clock), the new code no longer does this. Shall we? Signed-off-by: NWu Fengguang <fengguang.wu@intel.com> Acked-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Wu Fengguang 提交于
Signed-off-by: NWu Fengguang <fengguang.wu@intel.com> Acked-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Wu Fengguang 提交于
kerneltop's MAX_COUNTERS is increased from 8 to 64(the value used by perfstat). Signed-off-by: NWu Fengguang <fengguang.wu@intel.com> Acked-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Ingo Molnar 提交于
Initial version of kerneltop.c and perfstat.c. Acked-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Ingo Molnar 提交于
We'll have more files in that directory, prepare for that. Acked-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Paul Mackerras 提交于
Impact: build fix for powerpc Commit db3a944aca35ae61 ("perf_counter: revamp syscall input ABI") expanded the hw_event.type field into a union of structs containing bitfields. In particular it introduced a type field and a raw_type field, with the intention that the 1-bit raw_type field should overlay the most-significant bit of the 8-bit type field, and in fact perf_counter_alloc() now assumes that (or at least, assumes that raw_type doesn't overlay any of the bits that are 1 in the values of PERF_TYPE_{HARDWARE,SOFTWARE,TRACEPOINT}). Unfortunately this is not true on big-endian systems such as PowerPC, where bitfields are laid out from left to right, i.e. from most significant bit to least significant. This means that setting hw_event.type = PERF_TYPE_SOFTWARE will set hw_event.raw_type to 1. This fixes it by making the layout depend on whether or not __BIG_ENDIAN_BITFIELD is defined. It's a bit ugly, but that's what we get for using bitfields in a user/kernel ABI. Also, that commit didn't fix up some places in arch/powerpc/kernel/ perf_counter.c where hw_event.raw and hw_event.event_id were used. This fixes them too. Signed-off-by: NPaul Mackerras <paulus@samba.org>
-
由 Paul Mackerras 提交于
Impact: cleanup This updates the powerpc perf_counter_interrupt following on from the "perf_counter: unify irq output code" patch. Since we now use the generic perf_counter_output code, which sets the perf_counter_pending flag directly, we no longer need the need_wakeup variable. This removes need_wakeup and makes perf_counter_interrupt use get_perf_counter_pending() instead. Signed-off-by: NPaul Mackerras <paulus@samba.org> Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Cc: Steven Rostedt <rostedt@goodmis.org> Orig-LKML-Reference: <20090319194234.024464535@chello.nl> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Peter Zijlstra 提交于
Impact: cleanup Having 3 slightly different copies of the same code around does nobody any good. First step in revamping the output format. Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Steven Rostedt <rostedt@goodmis.org> Orig-LKML-Reference: <20090319194233.929962222@chello.nl> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Peter Zijlstra 提交于
Impact: modify ABI The hardware/software classification in hw_event->type became a little strained due to the addition of tracepoint tracing. Instead split up the field and provide a type field to explicitly specify the counter type, while using the event_id field to specify which event to use. Raw counters still work as before, only the raw config now goes into raw_event. Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Steven Rostedt <rostedt@goodmis.org> Orig-LKML-Reference: <20090319194233.836807573@chello.nl> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Peter Zijlstra 提交于
Impact: new perfcounters feature Enable usage of tracepoints as perf counter events. tracepoint event ids can be found in /debug/tracing/event/*/*/id and (for now) are represented as -65536+id in the type field. Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Steven Rostedt <rostedt@goodmis.org> Orig-LKML-Reference: <20090319194233.744044174@chello.nl> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Peter Zijlstra 提交于
Impact: fix crash during perfcounters use I found another counter free path, create a free_counter() call to accomodate generic tear-down. Fixes an RCU bug. Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Steven Rostedt <rostedt@goodmis.org> Orig-LKML-Reference: <20090319194233.652078652@chello.nl> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Peter Zijlstra 提交于
Impact: cleanup Use the generic software events for context switches. Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Steven Rostedt <rostedt@goodmis.org> Orig-LKML-Reference: <20090319194233.283522645@chello.nl> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Peter Zijlstra 提交于
Impact: fix boot crash When doing the generic context switch event I ran into some early boot hangs, which were caused by inf func recursion (event, fault, event, fault). I eventually tracked it down to event_list not being initialized at the time of the first event. Fix this. Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Steven Rostedt <rostedt@goodmis.org> Orig-LKML-Reference: <20090319194233.195392657@chello.nl> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Paul Mackerras 提交于
Impact: build fix for powerpc Commit bd753921015e7905 ("perf_counter: software counter event infrastructure") introduced a use of TIF_PERF_COUNTERS into the core perfcounter code. This breaks the build on powerpc because we use a flag in a per-cpu area to signal wakeups on powerpc rather than a thread_info flag, because the thread_info flags have to be manipulated with atomic operations and are thus slower than per-cpu flags. This fixes the by changing the core to use an abstracted set_perf_counter_pending() function, which is defined on x86 to set the TIF_PERF_COUNTERS flag and on powerpc to set the per-cpu flag (paca->perf_counter_pending). It changes the previous powerpc definition of set_perf_counter_pending to not take an argument and adds a clear_perf_counter_pending, so as to simplify the definition on x86. On x86, set_perf_counter_pending() is defined as a macro. Defining it as a static inline in arch/x86/include/asm/perf_counters.h causes compile failures because <asm/perf_counters.h> gets included early in <linux/sched.h>, and the definitions of set_tsk_thread_flag etc. are therefore not available in <asm/perf_counters.h>. (On powerpc this problem is avoided by defining set_perf_counter_pending etc. in <asm/hw_irq.h>.) Signed-off-by: NPaul Mackerras <paulus@samba.org>
-
由 Ingo Molnar 提交于
Impact: fix boot crash on Intel Perfmon Version 1 systems Intel Perfmon v1 does not support the global MSRs, nor does it offer the generalized MSR ranges. So support v2 and later CPUs only. Also mark pmc_ops as read-mostly - to avoid false cacheline sharing. Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Tim Blechmann 提交于
Impact: build fix In order to compile a kernel with performance counter patches, <asm/irq_regs.h> has to be included to provide the declaration of struct pt_regs *get_irq_regs(void); [ This bug was masked by unrelated x86 header file changes in the x86 tree, but occurs in the tip:perfcounters/core standalone tree. ] Signed-off-by: NTim Blechmann <tim@klingt.org> Orig-LKML-Reference: <20090314142925.49c29c17@thinkpad> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Peter Zijlstra 提交于
Impact: fix deadlock with perfstat Fix for the perfstat fubar.. We cannot unconditionally call hrtimer_cancel() without ever having done hrtimer_init() on the thing. Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Orig-LKML-Reference: <1236959027.22447.149.camel@twins> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Peter Zijlstra 提交于
I noticed that the counter_list only includes top-level counters, thus perf_swcounter_event() will miss sw-counters in groups. Since perf_swcounter_event() also wants an RCU safe list, create a new event_list that includes all counters and uses RCU list ops and use call_rcu to free the counter structure. Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Peter Zijlstra 提交于
Use hrtimers to profile timer based sampling for the software time counters. This allows platforms without hardware counter support to still perform sample based profiling. Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Peter Zijlstra 提交于
Provide separate sw counters for major and minor page faults. Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Peter Zijlstra 提交于
We use the generic software counter infrastructure to provide page fault events. Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Peter Zijlstra 提交于
Provide generic software counter infrastructure that supports software events. This will be used to allow sample based profiling based on software events such as pagefaults. The current infrastructure can only provide a count of such events, no place information. Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Peter Zijlstra 提交于
Fix a build warning on 32bit machines by explicitly marking the constants as 64-bit. Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Peter Zijlstra 提交于
We need to ensure the enabled=0 write happens before we start disabling the actual counters, so that a pcm_amd_enable() will not enable one underneath us. I think the race is impossible anyway, we always balance the ops within any one context and perform enable() with IRQs disabled. Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Peter Zijlstra 提交于
Instead of del/add use a move list-op. Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-
由 Peter Zijlstra 提交于
No need to assume the irq_period is 32bit. Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: NIngo Molnar <mingo@elte.hu>
-