Song Liu 7c7e3d31e7 bpf: Introduce helper bpf_find_vma ... In some profiler use cases, it is necessary to map an address to the backing file, e.g., a shared library. bpf_find_vma helper provides a flexible way to achieve this. bpf_find_vma maps an address of a task to the vma (vm_area_struct) for this address, and feed the vma to an callback BPF function. The callback function is necessary here, as we need to ensure mmap_sem is unlocked. It is necessary to lock mmap_sem for find_vma. To lock and unlock mmap_sem safely when irqs are disable, we use the same mechanism as stackmap with build_id. Specifically, when irqs are disabled, the unlocked is postponed in an irq_work. Refactor stackmap.c so that the irq_work is shared among bpf_find_vma and stackmap helpers. Signed-off-by: Song Liu <songliubraving@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Tested-by: Hengqi Chen <hengqi.chen@gmail.com> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20211105232330.1936330-2-songliubraving@fb.com		2021-11-07 11:54:51 -08:00
..
blktrace.c	block: don't call blk_status_to_errno in blk_update_request	2021-10-19 05:54:57 -06:00
bpf_trace.c	bpf: Introduce helper bpf_find_vma	2021-11-07 11:54:51 -08:00
bpf_trace.h	bpf: Use dedicated bpf_trace_printk event instead of trace_printk()	2020-07-13 16:55:49 -07:00
error_report-traces.c	tracing: add error_report_end trace point	2021-02-26 09:41:02 -08:00
fgraph.c	x86/ftrace: Make function graph use ftrace directly	2021-10-20 23:44:43 -04:00
ftrace_internal.h
ftrace.c	Tracing updates for 5.16:	2021-11-01 20:05:19 -07:00
Kconfig	tracing: Simplify the Kconfig dependency of FTRACE	2021-08-16 11:37:20 -04:00
kprobe_event_gen_test.c
Makefile	tracing: Place trace_pid_list logic into abstract functions	2021-10-05 17:30:08 -04:00
pid_list.c	tracing: Initialize upper and lower vars in pid_list_refill_irq()	2021-10-07 09:56:38 -04:00
pid_list.h	tracing: Create a sparse bitmask for pid filtering	2021-10-05 17:38:45 -04:00
power-traces.c
preemptirq_delay_test.c	kernel: trace: preemptirq_delay_test: add cpu affinity	2021-02-02 17:02:07 -05:00
ring_buffer_benchmark.c	sched,tracing: Convert to sched_set_fifo()	2020-07-29 11:43:53 +02:00
ring_buffer.c	tracing/perf: Add interrupt_context_level() helper	2021-10-19 20:33:20 -04:00
rpm-traces.c
synth_event_gen_test.c	tracing: Fix various typos in comments	2021-03-23 14:08:18 -04:00
trace_benchmark.c	tracing: Fix some typos in comments	2020-11-10 20:39:40 -05:00
trace_benchmark.h
trace_boot.c	tracing: Fix missing trace_boot_init_histograms kstrdup NULL checks	2021-10-26 09:18:10 -04:00
trace_branch.c	tracing: Merge irqflags + preempt counter.	2021-02-02 17:02:06 -05:00
trace_clock.c	tracing: Do no increment trace_clock_global() by one	2021-06-18 09:10:00 -04:00
trace_dynevent.c	tracing: Disable "other" permission bits in the tracefs files	2021-10-08 18:08:43 -04:00
trace_dynevent.h	tracing: Add DYNAMIC flag for dynamic events	2021-08-18 18:10:32 -04:00
trace_entries.h	trace: Add timerlat tracer	2021-06-25 19:57:24 -04:00
trace_eprobe.c	tracing: Fix misspelling of "missing"	2021-10-29 09:54:14 -04:00
trace_event_perf.c	tracing: Show size of requested perf buffer	2021-10-27 12:25:09 -04:00
trace_events_filter_test.h
trace_events_filter.c	tracing: Update create_system_filter() kernel-doc comment	2021-03-25 16:04:35 -04:00
trace_events_hist.c	Tracing updates for 5.16:	2021-11-01 20:05:19 -07:00
trace_events_inject.c	tracing: Merge irqflags + preempt counter.	2021-02-02 17:02:06 -05:00
trace_events_synth.c	tracing: Disable "other" permission bits in the tracefs files	2021-10-08 18:08:43 -04:00
trace_events_trigger.c	tracing: Add a probe that attaches to trace events	2021-08-20 14:18:40 -04:00
trace_events.c	tracing: Disable "other" permission bits in the tracefs files	2021-10-08 18:08:43 -04:00
trace_export.c	tracing: Fix some typos in comments	2020-11-10 20:39:40 -05:00
trace_functions_graph.c	tracing: in_irq() cleanup	2021-10-13 18:19:41 -04:00
trace_functions.c	ftrace: disable preemption when recursion locked	2021-10-27 11:21:49 -04:00
trace_hwlat.c	tracing/hwlat: Make some internal symbols static	2021-10-26 09:18:28 -04:00
trace_irqsoff.c	tracing: Merge irqflags + preempt counter.	2021-02-02 17:02:06 -05:00
trace_kdb.c	kdb: Rename members of struct kdbtab_t	2021-07-27 17:05:06 +01:00
trace_kprobe_selftest.c
trace_kprobe_selftest.h
trace_kprobe.c	tracing: Disable "other" permission bits in the tracefs files	2021-10-08 18:08:43 -04:00
trace_mmiotrace.c	tracing: Remove definition of DEBUG in trace_mmiotrace.c	2021-02-02 17:02:07 -05:00
trace_nop.c
trace_osnoise.c	trace/timerlat: Add migrate-disabled field to the timerlat header	2021-10-25 23:02:36 -04:00
trace_output.c	tracing: Show kretprobe unknown indicator only for kretprobe_trampoline	2021-09-30 21:24:08 -04:00
trace_output.h	ftrace: Add recording of functions that caused recursion	2020-11-06 08:42:26 -05:00
trace_preemptirq.c	lockdep: fix order in trace_hardirqs_off_caller()	2020-09-14 10:08:07 +02:00
trace_printk.c	tracing: Disable "other" permission bits in the tracefs files	2021-10-08 18:08:43 -04:00
trace_probe_tmpl.h	tracing/probes: Have process_fetch_insn() take a void * instead of pt_regs	2021-08-19 09:09:03 -04:00
trace_probe.c	tracing: Add a probe that attaches to trace events	2021-08-20 14:18:40 -04:00
trace_probe.h	tracing: Add a probe that attaches to trace events	2021-08-20 14:18:40 -04:00
trace_recursion_record.c	tracing: Disable "other" permission bits in the tracefs files	2021-10-08 18:08:43 -04:00
trace_sched_switch.c
trace_sched_wakeup.c	tracing: Change variable type as bool for clean-up	2021-06-30 09:19:14 -04:00
trace_selftest_dynamic.c
trace_selftest.c	tracing: Fix selftest config check for function graph start up test	2021-10-21 14:18:48 -04:00
trace_seq.c	tracing: Fix various typos in comments	2021-03-23 14:08:18 -04:00
trace_stack.c	tracing: Disable "other" permission bits in the tracefs files	2021-10-08 18:08:43 -04:00
trace_stat.c	tracing: Disable "other" permission bits in the tracefs files	2021-10-08 18:08:43 -04:00
trace_stat.h
trace_synth.h	tracing: synth events: increase max fields count	2021-09-08 15:29:16 -04:00
trace_syscalls.c	tracing: Merge irqflags + preempt counter.	2021-02-02 17:02:06 -05:00
trace_uprobe.c	tracing: Disable "other" permission bits in the tracefs files	2021-10-08 18:08:43 -04:00
trace.c	Tracing updates for 5.16:	2021-11-01 20:05:19 -07:00
trace.h	tracing: in_irq() cleanup	2021-10-13 18:19:41 -04:00
tracing_map.c	tracing/cfi: Fix cmp_entries_* functions signature mismatch	2021-10-19 20:33:20 -04:00
tracing_map.h	tracing: Fix some typos in comments	2020-11-10 20:39:40 -05:00