linux/samples, branch v4.6

samples/bpf: fix trace_output example

2016-04-28T21:29:45Z

llvm cannot always recognize memset as builtin function and optimize it away, so just delete it. It was a leftover from testing of bpf_perf_event_output() with large data structures. Fixes: 39111695b1b8 ("samples: bpf: add bpf_perf_event_output example") Signed-off-by: Alexei Starovoitov Signed-off-by: David S. Miller

samples/bpf: Enable powerpc support

2016-04-06T20:01:29Z

Add the necessary definitions for building bpf samples on ppc. Since ppc doesn't store function return address on the stack, modify how PT_REGS_RET() and PT_REGS_FP() work. Also, introduce PT_REGS_IP() to access the instruction pointer. Cc: Alexei Starovoitov Cc: Daniel Borkmann Cc: David S. Miller Cc: Ananth N Mavinakayanahalli Cc: Michael Ellerman Signed-off-by: Naveen N. Rao Acked-by: Alexei Starovoitov Signed-off-by: David S. Miller

samples/bpf: Use llc in PATH, rather than a hardcoded value

2016-04-06T20:01:28Z

While at it, remove the generation of .s files and fix some typos in the related comment. Cc: Alexei Starovoitov Cc: David S. Miller Cc: Daniel Borkmann Cc: Ananth N Mavinakayanahalli Cc: Michael Ellerman Signed-off-by: Naveen N. Rao Acked-by: Alexei Starovoitov Signed-off-by: David S. Miller

samples/bpf: Fix build breakage with map_perf_test_user.c

2016-04-06T20:01:28Z

Building BPF samples is failing with the below error: samples/bpf/map_perf_test_user.c: In function ‘main’: samples/bpf/map_perf_test_user.c:134:9: error: variable ‘r’ has initializer but incomplete type struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; ^ samples/bpf/map_perf_test_user.c:134:21: error: ‘RLIM_INFINITY’ undeclared (first use in this function) struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; ^ samples/bpf/map_perf_test_user.c:134:21: note: each undeclared identifier is reported only once for each function it appears in samples/bpf/map_perf_test_user.c:134:9: warning: excess elements in struct initializer [enabled by default] struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; ^ samples/bpf/map_perf_test_user.c:134:9: warning: (near initialization for ‘r’) [enabled by default] samples/bpf/map_perf_test_user.c:134:9: warning: excess elements in struct initializer [enabled by default] samples/bpf/map_perf_test_user.c:134:9: warning: (near initialization for ‘r’) [enabled by default] samples/bpf/map_perf_test_user.c:134:16: error: storage size of ‘r’ isn’t known struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; ^ samples/bpf/map_perf_test_user.c:139:2: warning: implicit declaration of function ‘setrlimit’ [-Wimplicit-function-declaration] setrlimit(RLIMIT_MEMLOCK, &r); ^ samples/bpf/map_perf_test_user.c:139:12: error: ‘RLIMIT_MEMLOCK’ undeclared (first use in this function) setrlimit(RLIMIT_MEMLOCK, &r); ^ samples/bpf/map_perf_test_user.c:134:16: warning: unused variable ‘r’ [-Wunused-variable] struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; ^ make[2]: *** [samples/bpf/map_perf_test_user.o] Error 1 Fix this by including the necessary header file. Cc: Alexei Starovoitov Cc: Daniel Borkmann Cc: David S. Miller Cc: Ananth N Mavinakayanahalli Cc: Michael Ellerman Acked-by: Alexei Starovoitov Signed-off-by: Naveen N. Rao Signed-off-by: David S. Miller

samples/bpf: add map performance test

2016-03-09T04:22:03Z

performance tests for hash map and per-cpu hash map with and without pre-allocation Signed-off-by: Alexei Starovoitov Signed-off-by: David S. Miller

samples/bpf: stress test bpf_get_stackid

2016-03-09T04:22:02Z

increase stress by also calling bpf_get_stackid() from various *spin* functions Signed-off-by: Alexei Starovoitov Signed-off-by: David S. Miller

samples/bpf: add bpf map stress test

2016-03-09T04:22:02Z

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 Signed-off-by: David S. Miller

samples/bpf: test both pre-alloc and normal maps

2016-03-08T20:28:32Z

extend test coveraged to include pre-allocated and run-time alloc maps Signed-off-by: Alexei Starovoitov Signed-off-by: David S. Miller

samples/bpf: add map_flags to bpf loader

2016-03-08T20:28:32Z

note old loader is compatible with new kernel. map_flags are optional Signed-off-by: Alexei Starovoitov Signed-off-by: David S. Miller

samples/bpf: move ksym_search() into library

2016-03-08T20:28:32Z

move ksym search from offwaketime into library to be reused in other tests Signed-off-by: Alexei Starovoitov Signed-off-by: David S. Miller