[GIT PULL] probes updates for v6.10

From: Google
Date: Wed May 15 2024 - 20:52:30 EST


Hi Linus,

Probes updates for v6.10:

- tracing/probes: Adding new pseudo-types %pd and %pD support for dumping
dentry name from 'struct dentry *' and file name from 'struct file *'.

- uprobes: Some performance optimizations have been done.
. Speed up the BPF uprobe event by delaying the fetching of the uprobe
event arguments that are not used in BPF.
. Avoid locking by speculatively checking whether uprobe event is valid.
. Reduce lock contention by using read/write_lock instead of spinlock for
uprobe list operation. This improved BPF uprobe benchmark result 43% on
average.

- rethook: Removes non-fatal warning messages when tracing stack from BPF
and skip rcu_is_watching() validation in rethook if possible.

- objpool: Optimizing objpool (which is used by kretprobes and fprobe as
rethook backend storage) by inlining functions and avoid caching nr_cpu_ids
because it is a const value.

- fprobe: Add entry/exit callbacks types (code cleanup)
- kprobes: Check ftrace was killed in kprobes if it uses ftrace.


Please pull the latest probes-v6.10 tree, which can be found at:


git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace.git
probes-v6.10

Tag SHA1: 9c42dca969de36a7aaa9573844a863bb306dcafc
Head SHA1: 1a7d0890dd4a502a202aaec792a6c04e6e049547


Andrii Nakryiko (7):
uprobes: encapsulate preparation of uprobe args buffer
uprobes: prepare uprobe args buffer lazily
uprobes: add speculative lockless system-wide uprobe filter check
ftrace: make extra rcu_is_watching() validation check optional
rethook: honor CONFIG_FTRACE_VALIDATE_RCU_IS_WATCHING in rethook_try_get()
objpool: enable inlining objpool_push() and objpool_pop() operations
objpool: cache nr_possible_cpus() and avoid caching nr_cpu_ids

Jiri Olsa (1):
fprobe: Add entry/exit callbacks types

Jonathan Haslam (1):
uprobes: reduce contention on uprobes_tree access

Kui-Feng Lee (1):
rethook: Remove warning messages printed for finding return address of a frame.

Masami Hiramatsu (Google) (1):
selftests/ftrace: Fix required features for VFS type test case

Stephen Brennan (1):
kprobe/ftrace: bail out if ftrace was killed

Ye Bin (5):
tracing/probes: support '%pd' type for print struct dentry's name
tracing/probes: support '%pD' type for print struct file's name
Documentation: tracing: add new type '%pd' and '%pD' for kprobe
selftests/ftrace: add kprobe test cases for VFS type "%pd" and "%pD"
selftests/ftrace: add fprobe test cases for VFS type "%pd" and "%pD"

----
Documentation/trace/kprobetrace.rst | 8 +-
arch/csky/kernel/probes/ftrace.c | 3 +
arch/loongarch/kernel/ftrace_dyn.c | 3 +
arch/parisc/kernel/ftrace.c | 3 +
arch/powerpc/kernel/kprobes-ftrace.c | 3 +
arch/riscv/kernel/probes/ftrace.c | 3 +
arch/s390/kernel/ftrace.c | 3 +
arch/x86/kernel/kprobes/ftrace.c | 3 +
include/linux/fprobe.h | 18 ++--
include/linux/kprobes.h | 7 ++
include/linux/objpool.h | 105 ++++++++++++++++++-
include/linux/trace_recursion.h | 2 +-
kernel/events/uprobes.c | 22 ++--
kernel/kprobes.c | 6 ++
kernel/trace/Kconfig | 13 +++
kernel/trace/ftrace.c | 1 +
kernel/trace/rethook.c | 4 +-
kernel/trace/trace.c | 2 +-
kernel/trace/trace_fprobe.c | 6 ++
kernel/trace/trace_kprobe.c | 6 ++
kernel/trace/trace_probe.c | 63 ++++++++++++
kernel/trace/trace_probe.h | 2 +
kernel/trace/trace_uprobe.c | 103 +++++++++++--------
lib/objpool.c | 112 ++-------------------
.../ftrace/test.d/dynevent/fprobe_args_vfs.tc | 41 ++++++++
.../ftrace/test.d/kprobe/kprobe_args_vfs.tc | 40 ++++++++
26 files changed, 406 insertions(+), 176 deletions(-)
create mode 100644 tools/testing/selftests/ftrace/test.d/dynevent/fprobe_args_vfs.tc
create mode 100644 tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_vfs.tc
--
Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>