The `-t` switch for specifying a thread id has been renamed
to `-L`. The `-T` switch specifies that a time column should
be provided, whereas the `-t` switch requests a relative
timestamp (from the beginning of the trace). This is more
consistent with other tools, and lets the user choose the
desired format for the time column, if any.

Add USDT support to C++ API

Improve linear histogram limit, and improve error message.

runqlen: use bpf_get_smp_processor_id()

add runqlen tool

check effective userid on run #850

add Quick Start Guide for bcc docker

docs: Update eBPF features list

Update of BPF features list, following the release of kernel 4.9.

offwaketime: update with get_stackid fixes #437

Expose perf event support in C++ API

Improve C++ API perf buffer polling

add support for bpf map flags

Make sure program FDs get cleaned up correctly

Fix for issue 829 I reported 

Needed to make array initialized to null before bpf_probe_read as the
verifier was rejecting the original code. will probably need to fix the
tutorial as well

updating my local repo

Fix bug of missing to install simple_tc.py

Signed-off-by: Zhiyi Sun <zhiyisun@gmail.com>

examples/networking/CMakeLists.txt set $EXAMPLE_PROGRAMS twice. The
second one(tc_perf_event.py) overwirte the first one(simple_tc.py).
Signed-off-by: Zhiyi Sun <zhiyisun@gmail.com>

Add support for aarch64

ABI for aarch64: register x0-x7 are used for parameter and result. In
bcc, there are 6 parameter registers are defined. So use x0-x5 as
parameter. frame pointer, link register, stack pointer and pc are added
in PT_REGS_xx according to arm64 architecture.

syscall number of bpf for aarch64 are defined in Kernel
header uapi/asm-generic/unistd.h.
Signed-off-by: Zhiyi Sun <zhiyisun@gmail.com>

Avoid unexpected log message on BPF program load error

bcc: add lru_hash and lru_percpu_hash map types