01 Nov, 2011
1 commit
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These files were getting via an implicit non-obvious
path, but we want to crush those out of existence since they cost
time during compiles of processing thousands of lines of headers
for no reason. Give them the lightweight header that just contains
the EXPORT_SYMBOL infrastructure.Signed-off-by: Paul Gortmaker
31 Oct, 2011
1 commit
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These files are doing things like module_put and try_module_get
so they need to call out the module.h for explicit inclusion,
rather than getting it via which we ideally want
to remove the module.h inclusion from.Signed-off-by: Paul Gortmaker
26 Oct, 2011
2 commits
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* 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (121 commits)
perf symbols: Increase symbol KSYM_NAME_LEN size
perf hists browser: Refuse 'a' hotkey on non symbolic views
perf ui browser: Use libslang to read keys
perf tools: Fix tracing info recording
perf hists browser: Elide DSO column when it is set to just one DSO, ditto for threads
perf hists: Don't consider filtered entries when calculating column widths
perf hists: Don't decay total_period for filtered entries
perf hists browser: Honour symbol_conf.show_{nr_samples,total_period}
perf hists browser: Do not exit on tab key with single event
perf annotate browser: Don't change selection line when returning from callq
perf tools: handle endianness of feature bitmap
perf tools: Add prelink suggestion to dso update message
perf script: Fix unknown feature comment
perf hists browser: Apply the dso and thread filters when merging new batches
perf hists: Move the dso and thread filters from hist_browser
perf ui browser: Honour the xterm colors
perf top tui: Give color hints just on the percentage, like on --stdio
perf ui browser: Make the colors configurable and change the defaults
perf tui: Remove unneeded call to newtCls on startup
perf hists: Don't format the percentage on hist_entry__snprintf
...Fix up conflicts in arch/x86/kernel/kprobes.c manually.
Ingo's tree did the insane "add volatile to const array", which just
doesn't make sense ("volatile const"?). But we could remove the const
*and* make the array volatile to make doubly sure that gcc doesn't
optimize it away..Also fix up kernel/trace/ring_buffer.c non-data-conflicts manually: the
reader_lock has been turned into a raw lock by the core locking merge,
and there was a new user of it introduced in this perf core merge. Make
sure that new use also uses the raw accessor functions. -
* 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (27 commits)
rtmutex: Add missing rcu_read_unlock() in debug_rt_mutex_print_deadlock()
lockdep: Comment all warnings
lib: atomic64: Change the type of local lock to raw_spinlock_t
locking, lib/atomic64: Annotate atomic64_lock::lock as raw
locking, x86, iommu: Annotate qi->q_lock as raw
locking, x86, iommu: Annotate irq_2_ir_lock as raw
locking, x86, iommu: Annotate iommu->register_lock as raw
locking, dma, ipu: Annotate bank_lock as raw
locking, ARM: Annotate low level hw locks as raw
locking, drivers/dca: Annotate dca_lock as raw
locking, powerpc: Annotate uic->lock as raw
locking, x86: mce: Annotate cmci_discover_lock as raw
locking, ACPI: Annotate c3_lock as raw
locking, oprofile: Annotate oprofilefs lock as raw
locking, video: Annotate vga console lock as raw
locking, latencytop: Annotate latency_lock as raw
locking, timer_stats: Annotate table_lock as raw
locking, rwsem: Annotate inner lock as raw
locking, semaphores: Annotate inner lock as raw
locking, sched: Annotate thread_group_cputimer as raw
...Fix up conflicts in kernel/posix-cpu-timers.c manually: making
cputimer->cputime a raw lock conflicted with the ABBA fix in commit
bcd5cff7216f ("cputimer: Cure lock inversion").
14 Oct, 2011
2 commits
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The trace_pipe_raw handler holds a cached page from the time the file
is opened to the time it is closed. The cached page is used to handle
the case of the user space buffer being smaller than what was read from
the ring buffer. The left over buffer is held in the cache so that the
next read will continue where the data left off.After EOF is returned (no more data in the buffer), the index of
the cached page is set to zero. If a user app reads the page again
after EOF, the check in the buffer will see that the cached page
is less than page size and will return the cached page again. This
will cause reading the trace_pipe_raw again after EOF to return
duplicate data, making the output look like the time went backwards
but instead data is just repeated.The fix is to not reset the index right after all data is read
from the cache, but to reset it after all data is read and more
data exists in the ring buffer.Cc: stable
Reported-by: Jeremy Eder
Signed-off-by: Steven Rostedt -
tracing_enabled option is deprecated.
To start/stop tracing, write to /sys/kernel/debug/tracing/tracing_on
without tracing_enabled. This patch is based on Linux 3.1.0-rc1Signed-off-by: Geunsik Lim
Link: http://lkml.kernel.org/r/1313127022-23830-1-git-send-email-leemgs1@gmail.com
Signed-off-by: Steven Rostedt
12 Oct, 2011
1 commit
11 Oct, 2011
3 commits
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When doing intense tracing, the kmalloc inside trace_marker can
introduce side effects to what is being traced.As trace_marker() is used by userspace to inject data into the
kernel ring buffer, it needs to do so with the least amount
of intrusion to the operations of the kernel or the user space
application.As the ring buffer is designed to write directly into the buffer
without the need to make a temporary buffer, and userspace already
went through the hassle of knowing how big the write will be,
we can simply pin the userspace pages and write the data directly
into the buffer. This improves the impact of tracing via trace_marker
tremendously!Thanks to Peter Zijlstra and Thomas Gleixner for pointing out the
use of get_user_pages_fast() and kmap_atomic().Suggested-by: Thomas Gleixner
Suggested-by: Peter Zijlstra
Signed-off-by: Steven Rostedt -
As the function tracer is very intrusive, lots of self checks are
performed on the tracer and if something is found to be strange
it will shut itself down keeping it from corrupting the rest of the
kernel. This shutdown may still allow functions to be traced, as the
tracing only stops new modifications from happening. Trying to stop
the function tracer itself can cause more harm as it requires code
modification.Although a WARN_ON() is executed, a user may not notice it. To help
the user see that something isn't right with the tracing of the system
a big warning is added to the output of the tracer that lets the user
know that their data may be incomplete.Reported-by: Thomas Gleixner
Signed-off-by: Steven Rostedt -
Fix kprobe-tracer not to delete a probe if the probe is in use.
In that case, delete operation will return -EBUSY.This bug can cause a kernel panic if enabled probes are deleted
during perf record.(Add some probes on functions)
sh-4.2# perf probe --del probe:\*
sh-4.2# exit
(kernel panic)This is originally reported on the fedora bugzilla:
https://bugzilla.redhat.com/show_bug.cgi?id=742383
I've also checked that this problem doesn't happen on
tracepoints when module removing because perf event
locks target module.$ sudo ./perf record -e xfs:\* -aR sh
sh-4.2# rmmod xfs
ERROR: Module xfs is in use
sh-4.2# exit
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.203 MB perf.data (~8862 samples) ]Signed-off-by: Masami Hiramatsu
Cc: Arnaldo Carvalho de Melo
Cc: Ingo Molnar
Cc: Frederic Weisbecker
Cc: Frank Ch. Eigler
Cc: stable@kernel.org
Link: http://lkml.kernel.org/r/20111004104438.14591.6553.stgit@fedora15
Signed-off-by: Steven Rostedt
08 Oct, 2011
1 commit
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* pm-runtime:
PM / Tracing: build rpm-traces.c only if CONFIG_PM_RUNTIME is set
PM / Runtime: Replace dev_dbg() with trace_rpm_*()
PM / Runtime: Introduce trace points for tracing rpm_* functions
PM / Runtime: Don't run callbacks under lock for power.irq_safe set
USB: Add wakeup info to debugging messages
PM / Runtime: pm_runtime_idle() can be called in atomic context
PM / Runtime: Add macro to test for runtime PM events
PM / Runtime: Add might_sleep() to runtime PM functions
30 Sep, 2011
1 commit
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Do not build kernel/trace/rpm-traces.c if CONFIG_PM_RUNTIME is not
set, which avoids a build failure.[rjw: Added the changelog and modified the subject slightly.]
Signed-off-by: Ming Lei
Signed-off-by: Rafael J. Wysocki
28 Sep, 2011
1 commit
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This patch introduces 3 trace points to prepare for tracing
rpm_idle/rpm_suspend/rpm_resume functions, so we can use these
trace points to replace the current dev_dbg().Signed-off-by: Ming Lei
Acked-by: Steven Rostedt
Signed-off-by: Rafael J. Wysocki
22 Sep, 2011
1 commit
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If irqs are disabled when preemption count reaches zero, the
preemptirqsoff tracer should not flag that as the end.When interrupts are enabled and preemption count is not zero
the preemptirqsoff correctly continues its tracing.Signed-off-by: Steven Rostedt
19 Sep, 2011
1 commit
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When debugging tight race conditions, it can be helpful to have a
synchronized tracing method. Although in most cases the global clock
provides this functionality, if timings is not the issue, it is more
comforting to know that the order of events really happened in a precise
order.Instead of using a clock, add a "counter" that is simply an incrementing
atomic 64bit counter that orders the events as they are perceived to
happen.The trace_clock_counter() is added from the attempt by Peter Zijlstra
trying to convert the trace_clock_global() to it. I took Peter's counter
code and made trace_clock_counter() instead, and added it to the choice
of clocks. Just echo counter > /debug/tracing/trace_clock to activate
it.Requested-by: Thomas Gleixner
Requested-by: Peter Zijlstra
Reviewed-By: Valdis Kletnieks
Signed-off-by: Steven Rostedt
13 Sep, 2011
1 commit
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The tracing locks can be taken in atomic context and therefore
cannot be preempted on -rt - annotate it.In mainline this change documents the low level nature of
the lock - otherwise there's no functional difference. Lockdep
and Sparse checking will work as usual.Signed-off-by: Thomas Gleixner
Signed-off-by: Ingo Molnar
31 Aug, 2011
3 commits
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The stats file under per_cpu folder provides the number of entries,
overruns and other statistics about the CPU ring buffer. However, the
numbers do not provide any indication of how full the ring buffer is in
bytes compared to the overall size in bytes. Also, it is helpful to know
the rate at which the cpu buffer is filling up.This patch adds an entry "bytes: " in printed stats for per_cpu ring
buffer which provides the actual bytes consumed in the ring buffer. This
field includes the number of bytes used by recorded events and the
padding bytes added when moving the tail pointer to next page.It also adds the following time stamps:
"oldest event ts:" - the oldest timestamp in the ring buffer
"now ts:" - the timestamp at the time of readingThe field "now ts" provides a consistent time snapshot to the userspace
when being read. This is read from the same trace clock used by tracing
event timestamps.Together, these values provide the rate at which the buffer is filling
up, from the formula:
bytes / (now_ts - oldest_event_ts)Signed-off-by: Vaibhav Nagarnaik
Cc: Michael Rubin
Cc: David Sharp
Link: http://lkml.kernel.org/r/1313531179-9323-3-git-send-email-vnagarnaik@google.com
Signed-off-by: Steven Rostedt -
The current file "buffer_size_kb" reports the size of per-cpu buffer and
not the overall memory allocated which could be misleading. A new file
"buffer_total_size_kb" adds up all the enabled CPU buffer sizes and
reports it. This is only a readonly entry.Signed-off-by: Vaibhav Nagarnaik
Cc: Michael Rubin
Cc: David Sharp
Link: http://lkml.kernel.org/r/1313531179-9323-2-git-send-email-vnagarnaik@google.com
Signed-off-by: Steven Rostedt -
The self testing for event filters does not really need preemption
disabled as there are no races at the time of testing, but the functions
it calls uses rcu_dereference_sched() which will complain if preemption
is not disabled.Cc: Jiri Olsa
Signed-off-by: Steven Rostedt
20 Aug, 2011
11 commits
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Adding automated tests running as late_initcall. Tests are
compiled in with CONFIG_FTRACE_STARTUP_TEST option.Adding test event "ftrace_test_filter" used to simulate
filter processing during event occurance.String filters are compiled and tested against several
test events with different values.Also testing that evaluation of explicit predicates is ommited
due to the lazy filter evaluation.Signed-off-by: Jiri Olsa
Link: http://lkml.kernel.org/r/1313072754-4620-11-git-send-email-jolsa@redhat.com
Signed-off-by: Steven Rostedt -
Changing filter_match_preds function to use unified predicates tree
processing.Signed-off-by: Jiri Olsa
Link: http://lkml.kernel.org/r/1313072754-4620-10-git-send-email-jolsa@redhat.com
Signed-off-by: Steven Rostedt -
Changing fold_pred_tree function to use unified predicates tree
processing.Signed-off-by: Jiri Olsa
Link: http://lkml.kernel.org/r/1313072754-4620-9-git-send-email-jolsa@redhat.com
Signed-off-by: Steven Rostedt -
Changing fold_pred_tree function to use unified predicates tree
processing.Signed-off-by: Jiri Olsa
Link: http://lkml.kernel.org/r/1313072754-4620-8-git-send-email-jolsa@redhat.com
Signed-off-by: Steven Rostedt -
Changing count_leafs function to use unified predicates tree
processing.Signed-off-by: Jiri Olsa
Link: http://lkml.kernel.org/r/1313072754-4620-7-git-send-email-jolsa@redhat.com
Signed-off-by: Steven Rostedt -
Adding walk_pred_tree function to be used for walking throught
the filter predicates.For each predicate the callback function is called, allowing
users to add their own functionality or customize their way
through the filter predicates.Changing check_pred_tree function to use walk_pred_tree.
Signed-off-by: Jiri Olsa
Link: http://lkml.kernel.org/r/1313072754-4620-6-git-send-email-jolsa@redhat.com
Signed-off-by: Steven Rostedt -
We dont need to perform lookup through the ftrace_events list,
instead we can use the 'tp_event' field.Each perf_event contains tracepoint event field 'tp_event', which
got initialized during the tracepoint event initialization.Signed-off-by: Jiri Olsa
Link: http://lkml.kernel.org/r/1313072754-4620-5-git-send-email-jolsa@redhat.com
Signed-off-by: Steven Rostedt -
The field_name was used just for finding event's fields. This way we
don't need to care about field_name allocation/free.Signed-off-by: Jiri Olsa
Link: http://lkml.kernel.org/r/1313072754-4620-4-git-send-email-jolsa@redhat.com
Signed-off-by: Steven Rostedt -
Making the code cleaner by having one function to fully prepare
the predicate (create_pred), and another to add the predicate to
the filter (filter_add_pred).As a benefit, this way the dry_run flag stays only inside the
replace_preds function and is not passed deeper.Signed-off-by: Jiri Olsa
Link: http://lkml.kernel.org/r/1313072754-4620-3-git-send-email-jolsa@redhat.com
Signed-off-by: Steven Rostedt -
Don't dynamically allocate filter_pred struct, use static memory.
This way we can get rid of the code managing the dynamic filter_pred
struct object.The create_pred function integrates create_logical_pred function.
This way the static predicate memory is returned only from
one place.Signed-off-by: Jiri Olsa
Link: http://lkml.kernel.org/r/1313072754-4620-2-git-send-email-jolsa@redhat.com
Signed-off-by: Steven Rostedt -
* 'for-linus' of git://git.kernel.dk/linux-block: (23 commits)
Revert "cfq: Remove special treatment for metadata rqs."
block: fix flush machinery for stacking drivers with differring flush flags
block: improve rq_affinity placement
blktrace: add FLUSH/FUA support
Move some REQ flags to the common bio/request area
allow blk_flush_policy to return REQ_FSEQ_DATA independent of *FLUSH
xen/blkback: Make description more obvious.
cfq-iosched: Add documentation about idling
block: Make rq_affinity = 1 work as expected
block: swim3: fix unterminated of_device_id table
block/genhd.c: remove useless cast in diskstats_show()
drivers/cdrom/cdrom.c: relax check on dvd manufacturer value
drivers/block/drbd/drbd_nl.c: use bitmap_parse instead of __bitmap_parse
bsg-lib: add module.h include
cfq-iosched: Reduce linked group count upon group destruction
blk-throttle: correctly determine sync bio
loop: fix deadlock when sysfs and LOOP_CLR_FD race against each other
loop: add BLK_DEV_LOOP_MIN_COUNT=%i to allow distros 0 pre-allocated loop devices
loop: add management interface for on-demand device allocation
loop: replace linked list of allocated devices with an idr index
...
11 Aug, 2011
2 commits
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Add FLUSH/FUA support to blktrace. As FLUSH precedes WRITE and/or
FUA follows WRITE, use the same 'F' flag for both cases and
distinguish them by their (relative) position. The end results
look like (other flags might be shown also):- WRITE: W
- WRITE_FLUSH: FW
- WRITE_FUA: WF
- WRITE_FLUSH_FUA: FWFNote that we reuse TC_BARRIER due to lack of bit space of act_mask
so that the older versions of blktrace tools will report flush
requests as barriers from now on.Cc: Steven Rostedt
Cc: Frederic Weisbecker
Cc: Ingo Molnar
Signed-off-by: Namhyung Kim
Reviewed-by: Jeff Moyer
Signed-off-by: Jens Axboe -
gcc incorrectly states that the variable "fmt" is uninitialized when
CC_OPITMIZE_FOR_SIZE is set.Instead of just blindly setting fmt to NULL, the code is cleaned up
a little to be a bit easier for humans to follow, as well as gcc
to know the variables are initialized.Signed-off-by: Steven Rostedt
05 Aug, 2011
1 commit
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Merge reason: Include most of the merge window trees, to do fixes on top.
Signed-off-by: Ingo Molnar
27 Jul, 2011
1 commit
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This allows us to move duplicated code in
(atomic_inc_not_zero() for now) toSigned-off-by: Arun Sharma
Reviewed-by: Eric Dumazet
Cc: Ingo Molnar
Cc: David Miller
Cc: Eric Dumazet
Acked-by: Mike Frysinger
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
25 Jul, 2011
1 commit
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What was scheduled to be 2.6.41 is now going to be 3.1 .
Signed-off-by: Jesper Juhl
Cc: Peter Zijlstra
Cc: Arnaldo Carvalho de Melo
Cc: Frederic Weisbecker
Cc: Steven Rostedt
Link: http://lkml.kernel.org/r/alpine.LNX.2.00.1107250929370.8080@swampdragon.chaosbits.net
Signed-off-by: Ingo Molnar
21 Jul, 2011
2 commits
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…stedt/linux-2.6-trace into perf/core
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Merge reason: pick up the latest fixes - they won't make v3.0.
Signed-off-by: Ingo Molnar
16 Jul, 2011
3 commits
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Since the address of a module-local variable can only be
solved after the target module is loaded, the symbol
fetch-argument should be updated when loading target
module.Signed-off-by: Masami Hiramatsu
Cc: Ingo Molnar
Cc: Peter Zijlstra
Cc: Frederic Weisbecker
Cc: Arnaldo Carvalho de Melo
Link: http://lkml.kernel.org/r/20110627072703.6528.75042.stgit@fedora15
Signed-off-by: Steven Rostedt -
To support probing module init functions, kprobe-tracer allows
user to define a probe on non-existed function when it is given
with a module name. This also enables user to set a probe on
a function on a specific module, even if a same name (but different)
function is locally defined in another module.The module name must be in the front of function name and separated
by a ':'. e.g. btrfs:btrfs_init_sysfsSigned-off-by: Masami Hiramatsu
Cc: Ingo Molnar
Cc: Peter Zijlstra
Cc: Frederic Weisbecker
Cc: Arnaldo Carvalho de Melo
Link: http://lkml.kernel.org/r/20110627072656.6528.89970.stgit@fedora15
Signed-off-by: Steven Rostedt -
Merge redundant enable/disable functions into enable_trace_probe()
and disable_trace_probe().Signed-off-by: Masami Hiramatsu
Cc: Arnaldo Carvalho de Melo
Cc: Ingo Molnar
Cc: Peter Zijlstra
Cc: yrl.pp-manager.tt@hitachi.com
Cc: Frederic Weisbecker
Cc: Ingo Molnar
Link: http://lkml.kernel.org/r/20110627072644.6528.26910.stgit@fedora15[ converted kprobe selftest to use enable_trace_probe ]
Signed-off-by: Steven Rostedt