linux-toradex.git/samples, branch v4.6-rc2 Linux kernel for Apalis and Colibri modules samples/bpf: add map performance test 2016-03-09T04:22:03+00:00 Alexei Starovoitov ast@fb.com 2016-03-08T23:07:54+00:00 26e9093110fb9ceb10093e4914b129b58d49a425 performance tests for hash map and per-cpu hash map with and without pre-allocation Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net> 
performance tests for hash map and per-cpu hash map
with and without pre-allocation

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
samples/bpf: stress test bpf_get_stackid 2016-03-09T04:22:02+00:00 Alexei Starovoitov ast@fb.com 2016-03-08T23:07:53+00:00 7dcc42b685b4acf7b2f3f08d157f1574e1bec7f7 increase stress by also calling bpf_get_stackid() from various *spin* functions Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net> 
increase stress by also calling bpf_get_stackid() from
various *spin* functions

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
samples/bpf: add bpf map stress test 2016-03-09T04:22:02+00:00 Alexei Starovoitov ast@fb.com 2016-03-08T23:07:52+00:00 9d8b612d88e81c2cf7dbc0d4a827da6ca0d848e0 this test calls bpf programs from different contexts: from inside of slub, from rcu, from pretty much everywhere, since it kprobes all spin_lock functions. It stresses the bpf hash and percpu map pre-allocation, deallocation logic and call_rcu mechanisms. User space part adding more stress by walking and deleting map elements. Note that due to nature bpf_load.c the earlier kprobe+bpf programs are already active while loader loads new programs, creates new kprobes and attaches them. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net> 
this test calls bpf programs from different contexts:
from inside of slub, from rcu, from pretty much everywhere,
since it kprobes all spin_lock functions.
It stresses the bpf hash and percpu map pre-allocation,
deallocation logic and call_rcu mechanisms.
User space part adding more stress by walking and deleting map elements.

Note that due to nature bpf_load.c the earlier kprobe+bpf programs are
already active while loader loads new programs, creates new kprobes and
attaches them.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
samples/bpf: test both pre-alloc and normal maps 2016-03-08T20:28:32+00:00 Alexei Starovoitov ast@fb.com 2016-03-08T05:57:21+00:00 c3f85cffc50d2f259903555979581a632b945ec2 extend test coveraged to include pre-allocated and run-time alloc maps Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net> 
extend test coveraged to include pre-allocated and run-time alloc maps

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
samples/bpf: add map_flags to bpf loader 2016-03-08T20:28:32+00:00 Alexei Starovoitov ast@fb.com 2016-03-08T05:57:20+00:00 89b976070190eb9dd14943c0d6ca4b7209f61405 note old loader is compatible with new kernel. map_flags are optional Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net> 
note old loader is compatible with new kernel.
map_flags are optional

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
samples/bpf: move ksym_search() into library 2016-03-08T20:28:32+00:00 Alexei Starovoitov ast@fb.com 2016-03-08T05:57:19+00:00 3622e7e4935105991dc648bca650c858576aecda move ksym search from offwaketime into library to be reused in other tests Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net> 
move ksym search from offwaketime into library to be reused
in other tests

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
samples/bpf: make map creation more verbose 2016-03-08T20:28:32+00:00 Alexei Starovoitov ast@fb.com 2016-03-08T05:57:18+00:00 618ec9a7b1fda46f8dd4a630ded983aeb51218f3 map creation is typically the first one to fail when rlimits are too low, not enough memory, etc Make this failure scenario more verbose Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net> 
map creation is typically the first one to fail when rlimits are
too low, not enough memory, etc
Make this failure scenario more verbose

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
samples/bpf: offwaketime example 2016-02-20T05:21:44+00:00 Alexei Starovoitov ast@fb.com 2016-02-18T03:58:59+00:00 a6ffe7b9df6228d11c5689914eceb488bc4e38df This is simplified version of Brendan Gregg's offwaketime: This program shows kernel stack traces and task names that were blocked and "off-CPU", along with the stack traces and task names for the threads that woke them, and the total elapsed time from when they blocked to when they were woken up. The combined stacks, task names, and total time is summarized in kernel context for efficiency. Example: $ sudo ./offwaketime | flamegraph.pl > demo.svg Open demo.svg in the browser as FlameGraph visualization. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net> 
This is simplified version of Brendan Gregg's offwaketime:
This program shows kernel stack traces and task names that were blocked and
"off-CPU", along with the stack traces and task names for the threads that woke
them, and the total elapsed time from when they blocked to when they were woken
up. The combined stacks, task names, and total time is summarized in kernel
context for efficiency.

Example:
$ sudo ./offwaketime | flamegraph.pl > demo.svg
Open demo.svg in the browser as FlameGraph visualization.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
samples/bpf: update tracex[23] examples to use per-cpu maps 2016-02-06T08:34:36+00:00 Alexei Starovoitov ast@fb.com 2016-02-02T06:39:58+00:00 3059303f59cf90a84e7fdef154ff0b215bcfaa97 Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net> 
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
samples/bpf: unit test for BPF_MAP_TYPE_PERCPU_ARRAY 2016-02-06T08:34:36+00:00 tom.leiming@gmail.com tom.leiming@gmail.com 2016-02-02T06:39:57+00:00 df570f577231407d929bdc6f59ae2f53e0028e8a A sanity test for BPF_MAP_TYPE_PERCPU_ARRAY Signed-off-by: Ming Lei <tom.leiming@gmail.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net> 
A sanity test for BPF_MAP_TYPE_PERCPU_ARRAY

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>