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dcad1a204f
linux/kernel/trace
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Namhyung Kim dcad1a204f tracing/uprobes: Fetch args before reserving a ring buffer 
Fetching from user space should be done in a non-atomic context.  So
use a per-cpu buffer and copy its content to the ring buffer
atomically.  Note that we can migrate during accessing user memory
thus use a per-cpu mutex to protect concurrent accesses.

This is needed since we'll be able to fetch args from an user memory
which can be swapped out.  Before that uprobes could fetch args from
registers only which saved in a kernel space.

While at it, use __get_data_size() and store_trace_args() to reduce
code duplication.  And add struct uprobe_cpu_buffer and its helpers as
suggested by Oleg.

Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
2014-01-02 16:17:44 -05:00
..
blktrace.c kernel: trace: blktrace: remove redundent memcpy() in compat_blk_trace_setup() 2013-11-08 09:04:30 -07:00
ftrace.c tracing: Add generic tracing_lseek() function 2014-01-02 16:17:12 -05:00
Kconfig ring-buffer: Select IRQ_WORK 2013-05-03 19:24:17 -04:00
Makefile tracing: Add basic event trigger framework 2013-12-20 18:40:22 -05:00
power-traces.c PM / tracing: remove deprecated power trace API 2013-01-26 00:39:12 +01:00
ring_buffer_benchmark.c tracing: Use NUMA allocation for per-cpu ring buffer pages 2011-06-14 22:04:39 -04:00
ring_buffer.c tracing: Typo fix on ring buffer comments 2013-07-18 21:31:26 -04:00
rpm-traces.c PM / Runtime: Introduce trace points for tracing rpm_* functions 2011-09-27 22:53:27 +02:00
trace_branch.c tracing: Update event filters for multibuffer 2013-11-05 16:50:20 -05:00
trace_clock.c tracing: Add "uptime" trace clock that uses jiffies 2013-03-15 00:36:09 -04:00
trace_entries.h tracing: Add trace_puts() for even faster trace_printk() tracing 2013-03-15 00:35:55 -04:00
trace_event_perf.c perf/trace: Properly use u64 to hold event_id 2013-11-19 16:57:44 +01:00
trace_events_filter_test.h tracing/filter: Add startup tests for events filter 2011-08-19 14:35:59 -04:00
trace_events_filter.c tracing: Add and use generic set_trigger_filter() implementation 2013-12-21 22:02:17 -05:00
trace_events_trigger.c tracing: Fix rcu handling of event_trigger_data filter field 2014-01-02 16:17:22 -05:00
trace_events.c tracing: Move ftrace_event_file() out of DYNAMIC_FTRACE ifdef 2013-12-21 22:02:17 -05:00
trace_export.c tracing: Update event filters for multibuffer 2013-11-05 16:50:20 -05:00
trace_functions_graph.c tracing: Do not use signed enums with unsigned long long in fgragh output 2013-11-06 15:26:56 -05:00
trace_functions.c tracing: Add ref_data to function and fgraph tracer structs 2013-07-18 21:31:31 -04:00
trace_irqsoff.c tracing: Use flag buffer_disabled for irqsoff tracer 2013-07-01 20:34:28 -04:00
trace_kdb.c tracing: Consolidate max_tr into main trace_array structure 2013-03-15 00:35:40 -04:00
trace_kprobe.c tracing/probes: Implement 'memory' fetch method for uprobes 2014-01-02 16:17:43 -05:00
trace_mmiotrace.c tracing: Update event filters for multibuffer 2013-11-05 16:50:20 -05:00
trace_nop.c
trace_output.c ftrace, sched: Add TRACE_FLAG_PREEMPT_RESCHED 2013-11-11 12:43:39 +01:00
trace_output.h tracing: Rename trace_event_mutex to trace_event_sem 2013-03-15 13:22:10 -04:00
trace_printk.c tracing: Add __tracepoint_string() to export string pointers 2013-07-26 13:39:44 -04:00
trace_probe.c tracing/probes: Implement 'memory' fetch method for uprobes 2014-01-02 16:17:43 -05:00
trace_probe.h tracing/probes: Implement 'memory' fetch method for uprobes 2014-01-02 16:17:43 -05:00
trace_sched_switch.c tracing: Update event filters for multibuffer 2013-11-05 16:50:20 -05:00
trace_sched_wakeup.c tracing: Add function-trace option to disable function tracing of latency tracers 2013-03-15 00:36:08 -04:00
trace_selftest_dynamic.c ftrace: Add self-tests for multiple function trace users 2011-05-18 19:24:51 -04:00
trace_selftest.c ftrace: Do not run selftest if command line parameter is set 2013-07-01 20:57:15 -04:00
trace_stack.c tracing: Add generic tracing_lseek() function 2014-01-02 16:17:12 -05:00
trace_stat.c trace/trace_stat: use rbtree postorder iteration helper instead of opencoding 2013-11-05 16:01:47 -05:00
trace_stat.h tracing/stat: Add stat_release() callback 2009-07-10 12:14:05 +02:00
trace_syscalls.c tracing: Add and use generic set_trigger_filter() implementation 2013-12-21 22:02:17 -05:00
trace_uprobe.c tracing/uprobes: Fetch args before reserving a ring buffer 2014-01-02 16:17:44 -05:00
trace.c tracing: Add generic tracing_lseek() function 2014-01-02 16:17:12 -05:00
trace.h tracing: Fix rcu handling of event_trigger_data filter field 2014-01-02 16:17:22 -05:00