在 2015/5/15 16:03, Ingo Molnar 写道:
Just a small stylistic side note:
Wang Nan (37):
tools perf: set vmlinux_path__nr_entries to 0 in vmlinux_path__exit.
tools lib traceevent: install libtraceevent.a into libdir.
tools build: Allow other override features to check.
tools include: a
在 2015/5/15 13:37, Alexei Starovoitov 写道:
On 5/14/15 8:54 PM, Wangnan (F) wrote:
Hi Alexei Starovoitov and other,
I triggered a kernel panic when developing my 'perf bpf' facility. The
call stack is listed at the bottom of
this mail.
I attached two bpf programs on 'kmem_ca
在 2015/5/15 16:48, Ingo Molnar 写道:
* Wangnan (F) wrote:
perf tools: Set vmlinux_path__nr_entries to 0 in vmlinux_path__exit
tools lib traceevent: Install libtraceevent.a into libdir
tools: Allow other override features to check
Hm, to check what? Not sure I can parse this sentence
在 2015/5/18 20:29, Namhyung Kim 写道:
Hi,
On Sun, May 17, 2015 at 10:56:41AM +, Wang Nan wrote:
This patch collects all programs in an object file into an array of
'struct bpf_program' for further processing. That structure is for
representing each eBPF program. 'bpf_prog' should be a bette
在 2015/5/19 1:35, Alexei Starovoitov 写道:
On 5/17/15 3:56 AM, Wang Nan wrote:
This is the first patch of libbpf. The goal of libbpf is to create a
standard way for accessing eBPF object files. This patch creates
Makefile and Build for it, allows 'make' to build libbpf.a and
libbpf.so, 'make ins
On 2016/4/20 15:59, Jiri Olsa wrote:
On Mon, Apr 18, 2016 at 02:55:29PM +, Wang Nan wrote:
Without this patch, the last output doesn't have timestamp appended if
--timestamp-filename is not explicitly provided. For example:
# perf record -a --switch-output &
[1] 11224
# kill -s S
On 2016/4/21 6:06, Alexei Starovoitov wrote:
On Wed, Apr 20, 2016 at 06:01:40PM +, Wang Nan wrote:
This patch set allows to perf invoke some user space BPF scripts on some
point. uBPF scripts and kernel BPF scripts reside in one BPF object.
They communicate with each other with BPF maps. u
Hi,
When testing kprobe v12 we find a bug
# echo 'p:kprobes/mykprobe1 ftrace_enable_fops' >
/sys/kernel/debug/tracing/kprobe_events
# echo 1 > /sys/kernel/debug/tracing/events/kprobes/mykprobe1/enable
Unable to handle kernel paging request at virtual address d42003f0
pgd = ffc009f64000
[d
On 2016/4/8 4:58, Arnaldo Carvalho de Melo wrote:
From: Arnaldo Carvalho de Melo
We used libaudit to map ids to syscall names and vice-versa, but that
imposes a delay in supporting new syscalls, having to wait for libaudit
to get those new syscalls on its tables.
To remove that delay, for x8
On 2016/4/8 22:58, Arnaldo Carvalho de Melo wrote:
Em Fri, Apr 08, 2016 at 11:14:09AM +0200, Thierry Reding escreveu:
From: Thierry Reding
The KBUILD_OUTPUT environment can be used to set the build directory as
an alternative to passing the O variable on the command-line. This works
with reg
Sorry. This patch should be squash into patch 1/4. The commit message
is wrong. The main part of described patch is already accepted and merged:
1d6c940 perf trace: Print content of bpf-output event
Thank you.
On 2016/4/8 23:07, Wang Nan wrote:
With this patch the contend of BPF output event i
On 2016/4/8 23:22, Arnaldo Carvalho de Melo wrote:
Em Fri, Apr 08, 2016 at 03:07:22PM +, Wang Nan escreveu:
Before this patch, strange error message is provided if passed a
non-tracepoint event to 'perf trace':
# perf trace -a --ev cycles sleep 1
Failed to set filter "common_pid != 2
On 2016/3/30 10:38, Wangnan (F) wrote:
On 2016/3/30 10:28, Wangnan (F) wrote:
On 2016/3/29 22:04, Peter Zijlstra wrote:
On Mon, Mar 28, 2016 at 06:41:32AM +, Wang Nan wrote:
Could you maybe write a perf/tests thingy for this so that _some_
userspace exists that exercises this new
On 2016/3/29 22:04, Peter Zijlstra wrote:
On Mon, Mar 28, 2016 at 06:41:32AM +, Wang Nan wrote:
Could you maybe write a perf/tests thingy for this so that _some_
userspace exists that exercises this new code?
Yes. Please see:
http://lkml.kernel.org/r/1460022180-61262-1-git-send-email-
On 2016/4/17 19:50, Jiri Olsa wrote:
On Fri, Apr 15, 2016 at 06:20:15PM +, Wang Nan wrote:
Create a new class named 'trigger' to model the state of a trigger and
implement auxtrace_snapshot with it.
auxtrace_record__snapshot_started and auxtrace_snapshot_err are absorbed.
'trigger' defin
On 2016/4/18 21:45, Jiri Olsa wrote:
On Mon, Apr 18, 2016 at 06:32:08AM +, Wang Nan wrote:
Use 'trigger' to model operations which need to be executed when
an event (a signal, for example) is observed.
States and transits:
OFF--(on)--> READY --(toggle)--> TOGGLED --(process)--> PROCESS
On 2016/4/18 22:29, Jiri Olsa wrote:
On Mon, Apr 18, 2016 at 10:20:23PM +0800, Wangnan (F) wrote:
On 2016/4/18 21:45, Jiri Olsa wrote:
On Mon, Apr 18, 2016 at 06:32:08AM +, Wang Nan wrote:
Use 'trigger' to model operations which need to be executed when
an event (a signal, f
On 2016/4/26 16:56, Ravi Bangoria wrote:
Thanks Masami for reviewing.
Please find my replies to your comment.
On Tuesday 26 April 2016 02:54 AM, Masami Hiramatsu wrote:
Hi Ravi,
On Mon, 25 Apr 2016 16:08:27 +0530
Ravi Bangoria wrote:
Perf can add a probe on kernel module which has not be
On 2016/3/29 20:54, Peter Zijlstra wrote:
On Mon, Mar 28, 2016 at 06:41:29AM +, Wang Nan wrote:
Add new ioctl() to pause/resume ring-buffer output.
In some situations we want to read from ring buffer only when we
ensure nothing can write to the ring buffer during reading. Without
this pat
On 2016/3/29 22:04, Peter Zijlstra wrote:
On Mon, Mar 28, 2016 at 06:41:32AM +, Wang Nan wrote:
Could you maybe write a perf/tests thingy for this so that _some_
userspace exists that exercises this new code?
int perf_output_begin(struct perf_output_handle *handle,
On 2016/3/30 10:28, Wangnan (F) wrote:
On 2016/3/29 22:04, Peter Zijlstra wrote:
On Mon, Mar 28, 2016 at 06:41:32AM +, Wang Nan wrote:
Could you maybe write a perf/tests thingy for this so that _some_
userspace exists that exercises this new code?
int perf_output_begin(struct
On 2016/4/1 2:08, Arnaldo Carvalho de Melo wrote:
Hi Wang,
Trying to get back at working with 'perf trace' + BPF and I'm
noticing that the perf_event_attr->sample_type for the BPF events are
different than the ones for the raw_syscalls:sys_{enter,exit} or to
other tracepoint events we
Hi Peter,
When would you consider collection this patch? You have
collected all dependencies, this is the last patch to enable
the backward attribute. I have already posted a 'perf test'
testcase for it so there will be some usable user space code.
I will start posting my perf side code again
On 2015/11/5 6:09, Arnaldo Carvalho de Melo wrote:
Em Wed, Nov 04, 2015 at 11:20:04AM +, Wang Nan escreveu:
This patch introduces a new macro "__NR_CPUS__" to perf's embedded
clang compiler, which represent the available CPU counters in this
available "CPU counters"? ENOPARSE :-)
Your c
On 2015/11/5 6:01, Arnaldo Carvalho de Melo wrote:
Em Wed, Nov 04, 2015 at 02:25:58AM +, Wang Nan escreveu:
In this patch, a series libbpf specific error numbers and
libbpf_strerror() are created to help reporting error to caller.
Functions are updated to pass correct error number through
On 2015/11/5 9:48, Wangnan (F) wrote:
On 2015/11/5 6:01, Arnaldo Carvalho de Melo wrote:
Em Wed, Nov 04, 2015 at 02:25:58AM +, Wang Nan escreveu:
In this patch, a series libbpf specific error numbers and
libbpf_strerror() are created to help reporting error to caller.
Functions are
On 2015/11/6 15:12, 平松雅巳 / HIRAMATU，MASAMI wrote:
From: a...@kernel.org [mailto:a...@kernel.org]
Em Thu, Nov 05, 2015 at 02:08:48PM +, 平松雅巳 / HIRAMATU，MASAMI escreveu:
From: Wang Nan [mailto:wangn...@huawei.com]
It is possible that find_perf_probe_point_from_map() fails to find
symbol bu
On 2015/11/6 16:30, Wangnan (F) wrote:
On 2015/11/6 15:12, 平松雅巳 / HIRAMATU，MASAMI wrote:
From: a...@kernel.org [mailto:a...@kernel.org]
Em Thu, Nov 05, 2015 at 02:08:48PM +, 平松雅巳 /
HIRAMATU，MASAMI escreveu:
From: Wang Nan [mailto:wangn...@huawei.com]
[SNIP]
Ah, finally I got what
On 2015/11/6 21:19, Arnaldo Carvalho de Melo wrote:
Em Fri, Nov 06, 2015 at 09:46:12AM +, Wang Nan escreveu:
In dso__split_kallsyms_for_kcore(), current code adjusts symbol's
address but only reinsert it into rbtree if the symbol belongs to
another map. However, the expression for adjustin
On 2015/10/30 6:37, Arnaldo Carvalho de Melo wrote:
Em Wed, Oct 14, 2015 at 12:41:21PM +, Wang Nan escreveu:
This patch replaces the original toy BPF program with previous introduced
bpf-script-example.c. Dynamically embedded it into 'llvm-src.c'.
The newly introduced BPF program attaches
On 2015/10/30 6:44, Arnaldo Carvalho de Melo wrote:
Em Wed, Oct 14, 2015 at 12:41:24PM +, Wang Nan escreveu:
In this patch, caller of libbpf is able to control the loaded programs
by installing a preprocessor callback for a BPF program. With
preprocessor, different instances can be created
On 2015/11/20 23:34, Arnaldo Carvalho de Melo wrote:
Em Fri, Nov 20, 2015 at 09:25:36PM +0800, Wangnan (F) escreveu:
+ case BPF_MAP_PRIV_KEY_INDICS:
+ for (i = 0; i < priv->key.indics.nr_indics; i++) {
+ u64 _idx
On 2015/11/23 10:01, Wangnan (F) wrote:
On 2015/11/20 23:34, Arnaldo Carvalho de Melo wrote:
Em Fri, Nov 20, 2015 at 09:25:36PM +0800, Wangnan (F) escreveu:
+case BPF_MAP_PRIV_KEY_INDICS:
+for (i = 0; i < priv->key.indics.nr_indics; i++) {
+u6
On 2015/10/17 18:48, Wang Nan wrote:
bpf__config_obj() is introduced as a core API to config BPF object
after loading. One configuration option of maps is introduced. After
this patch BPF object can accept configuration like:
maps.my_map.value=1234
This patch is more complex than the work i
On 2015/6/29 22:33, Arnaldo Carvalho de Melo wrote:
Em Sat, Jun 27, 2015 at 12:25:45PM +, Wang Nan escreveu:
Before this patch, add_perf_probe_events() init symbol maps only for
uprobe if the first 'struct perf_probe_event' passed to it is a uprobe
event. This is a trick because 'perf prob
On 2015/6/30 3:41, Arnaldo Carvalho de Melo wrote:
Em Mon, Jun 29, 2015 at 04:21:51PM -0300, Arnaldo Carvalho de Melo escreveu:
Em Fri, Jun 26, 2015 at 02:15:07PM +, Wang Nan escreveu:
In this patch, eBPF API is checked by compiling a c source file which
uses fields in bpf_attr which will
On 2015/6/30 22:34, Arnaldo Carvalho de Melo wrote:
Em Tue, Jun 30, 2015 at 10:29:08AM +0800, Wangnan (F) escreveu:
On 2015/6/30 3:41, Arnaldo Carvalho de Melo wrote:
So, what should I do now? I want to have that OFF line turned to "on",
so that I can test this stuff.
But the chan
On 2015/6/30 22:37, Arnaldo Carvalho de Melo wrote:
Em Tue, Jun 30, 2015 at 09:38:26AM +0800, Wangnan (F) escreveu:
On 2015/6/29 22:33, Arnaldo Carvalho de Melo wrote:
Em Sat, Jun 27, 2015 at 12:25:45PM +, Wang Nan escreveu:
Before this patch, add_perf_probe_events() init symbol maps
On 2015/7/1 13:44, Peter Zijlstra wrote:
On Wed, Jul 01, 2015 at 02:57:30AM +, He Kuang wrote:
This patch adds an extra perf trace buffer for other utilities like
bpf to fill extra data to perf events.
What!, why?
The goal of this patchset is to give BPF program a mean to output
someth
On 2015/7/2 11:50, Alexei Starovoitov wrote:
On 6/30/15 7:57 PM, He Kuang wrote:
When we add a kprobe point and record events by perf, the execution path
of all threads on each cpu will enter this point, but perf may only
record events on a particular thread or cpu at this kprobe point, a
chec
On 2015/7/2 11:52, Alexei Starovoitov wrote:
On 7/1/15 8:38 PM, He Kuang wrote:
On 2015/7/2 10:48, Alexei Starovoitov wrote:
On 7/1/15 4:58 AM, Peter Zijlstra wrote:
But why create a separate trace buffer, it should go into the regular
perf buffer.
+1
I think
+static char __percpu *per
On 2015/9/15 5:37, Arnaldo Carvalho de Melo wrote:
Em Sun, Sep 06, 2015 at 07:13:35AM +, Wang Nan escreveu:
regs_query_register_offset() is a helper function which converts
register name like "%rax" to offset of a register in 'struct pt_regs',
which is required by BPF prologue generator. S
Hi Arnaldo,
Could you please collect this patch to your tree? It fixes a segfault
when only one of kprobe and uprobe is enabled.
Thank you.
On 2015/11/6 17:50, Wang Nan wrote:
On kernel with only one of CONFIG_KPROBE_EVENTS and
CONFIG_UPROBE_EVENTS enabled, 'perf probe -d' causes segfault beca
On 2015/11/6 21:59, Adrian Hunter wrote:
On 06/11/15 15:19, Arnaldo Carvalho de Melo wrote:
Em Fri, Nov 06, 2015 at 09:46:12AM +, Wang Nan escreveu:
In dso__split_kallsyms_for_kcore(), current code adjusts symbol's
address but only reinsert it into rbtree if the symbol belongs to
another
On 2015/11/13 23:46, Arnaldo Carvalho de Melo wrote:
Em Fri, Nov 13, 2015 at 12:29:14PM +, Wang Nan escreveu:
By extending the syntax of BPF object section names, this patch allows
user to config probing options like what they can do in 'perf probe'.
Test result:
For following BPF file b
On 2015/11/17 9:29, Arnaldo Carvalho de Melo wrote:
Em Mon, Nov 16, 2015 at 12:10:14PM +, Wang Nan escreveu:
This patch introduces a new BPF script to test BPF prologue. The new
script probes at null_lseek, which is the function pointer when we try
to lseek on '/dev/null'.
null_lseek is c
On 2015/11/16 20:10, Wang Nan wrote:
This patch allows creating only one BPF program for different
'probe_trace_event'(tev) generated by one 'perf_probe_event'(pev), if
their prologues are identical.
This is done by comparing argument list of different tev, and maps type
of prologue and tev us
On 2015/11/17 3:02, Arnaldo Carvalho de Melo wrote:
Em Mon, Nov 16, 2015 at 12:10:09PM +, Wang Nan escreveu:
This patch is a preparation for BPF prologue support which allows
generating a series of BPF bytecode for fetching kernel data before
calling program code. With the newly introduced
On 2015/11/17 9:29, Arnaldo Carvalho de Melo wrote:
Em Mon, Nov 16, 2015 at 12:10:14PM +, Wang Nan escreveu:
This patch introduces a new BPF script to test BPF prologue. The new
script probes at null_lseek, which is the function pointer when we try
to lseek on '/dev/null'.
null_lseek is c
Hi Arnaldo,
On 2015/11/17 9:29, Arnaldo Carvalho de Melo wrote:
[SNIP]
I've pushed everything to my perf/ebpf branch, please let me know if
what is there is acceptable, then it will be up to Ingo to decide where
to put this, if in perf/urgent for this merge window, or in perf/core,
for the next
On 2015/11/3 18:44, Wang Nan wrote:
According to [1], libbpf should be muted. This patch reset info and
warning message level to ensure libbpf doesn't output anything even
if error happened.
[1] http://lkml.kernel.org/r/20151020151255.gf5...@kernel.org
Sorry...
Signed-off-by: Wang Nan
Cc:
On 2015/11/4 2:24, Arnaldo Carvalho de Melo wrote:
Em Thu, Oct 15, 2015 at 07:58:38PM +0800, Wangnan (F) escreveu:
+void test__llvm_prepare(void)
+{
+ p_test_llvm__bpf_result = mmap(NULL, SHARED_BUF_INIT_SIZE,
+ PROT_READ | PROT_WRITE
On 2015/11/3 23:43, Arnaldo Carvalho de Melo wrote:
Em Tue, Nov 03, 2015 at 10:44:41AM +, Wang Nan escreveu:
This patchset is based on tip/core.
Arnaldo found some confusing error reports when reviewing BPF related
patches. This patch set makes some changes:
Thanks for working on this!
On 2016/12/6 5:48, Arnaldo Carvalho de Melo wrote:
Em Mon, Dec 05, 2016 at 07:02:48PM -0200, Arnaldo Carvalho de Melo escreveu:
Em Mon, Dec 05, 2016 at 08:51:01AM -0800, Alexei Starovoitov escreveu:
yeah. it's kinda high. I'm guessing rpm llvm libs are in debug mode.
Try llvm-config --build-m
On 2016/12/6 15:13, Wang Nan wrote:
Cancel builtin llvm and clang support when LLVM version is
less than 3.9.0: following commits uses newer API.
Since Clang/LLVM's API is not guaranteed to be stable,
add a test-llvm-version.cpp feature checker, issue warning if
LLVM found in compiling environ
On 2017/1/19 7:57, Joe Stringer wrote:
Commit 4708bbda5cb2 ("tools lib bpf: Fix maps resolution") attempted to
fix map resolution by identifying the number of symbols that point to
maps, and using this number to resolve each of the maps.
However, during relocation the original definition of th
On 2017/1/19 7:57, Joe Stringer wrote:
"Larger" is the comparative adjective form of "large".
Signed-off-by: Joe Stringer
---
tools/lib/bpf/libbpf.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 350ee4c59f85..653b1
On 2017/1/19 7:57, Joe Stringer wrote:
Add a new API to pin a BPF object to the filesystem. The user can
specify a subdirectory under the BPF filesystem to pin these programs.
For example, with the subdirectory 'foo', programs and maps are pinned:
/sys/fs/bpf/foo/progs/PROG_NAME
/sys/fs/bpf/fo
On 2017/1/19 7:57, Joe Stringer wrote:
Patch 1 fixes an issue when using drastically different BPF map definitions
inside ELFs from a client using libbpf, vs the map definition libbpf uses.
Patch 2 is a trivial typo fix.
Patches 3-5 add some simple, useful helper functions for setting prog ty
On 2017/1/23 9:11, Joe Stringer wrote:
Add a new API to pin a BPF program to the filesystem. The user can
specify the path full path within a BPF filesystem to pin the program.
Programs with multiple instances are pinned as 'foo', 'foo_1', 'foo_2',
and so on.
Signed-off-by: Joe Stringer
---
v
On 2017/1/25 9:04, Wangnan (F) wrote:
On 2017/1/23 9:11, Joe Stringer wrote:
Add a new API to pin a BPF program to the filesystem. The user can
specify the path full path within a BPF filesystem to pin the program.
Programs with multiple instances are pinned as 'foo', 'foo_1
On 2017/1/25 9:16, Joe Stringer wrote:
On 24 January 2017 at 17:06, Wangnan (F) wrote:
On 2017/1/25 9:04, Wangnan (F) wrote:
On 2017/1/23 9:11, Joe Stringer wrote:
Add a new API to pin a BPF program to the filesystem. The user can
specify the path full path within a BPF filesystem to
On 2016/6/22 22:33, Nilay Vaish wrote:
On 22 June 2016 at 04:08, Wang Nan wrote:
@@ -549,17 +573,72 @@ static struct perf_event_header finished_round_event = {
.type = PERF_RECORD_FINISHED_ROUND,
};
-static int record__mmap_read_all(struct record *rec)
+static void
+record__toggle
On 2016/6/22 21:40, Arnaldo Carvalho de Melo wrote:
Em Wed, Jun 22, 2016 at 08:17:02AM -0500, Nilay Vaish escreveu:
On 22 June 2016 at 04:08, Wang Nan wrote:
+struct perf_evlist *perf_evlist__new_aux(struct perf_evlist *parent)
+{
+ struct perf_evlist *evlist;
+
+ if (perf_evlist
Hi,
This patch fixes a real crash problem when we do 'perf report'
on an arm64 platform with arm32 program.
It is introduced by commit f9b2bdf228 ("perf tools: Find vdso
with the consider of cross-platform"). From dmesg report, perf
crashes in dso__type() because dso is NULL.
Still don't know wh
On 2016/7/6 18:53, Jiri Olsa wrote:
On Mon, Jul 04, 2016 at 06:20:02AM +, Wang Nan wrote:
SNIP
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 0fea724..3abe519 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -1359,6 +1359,9 @@ static int __perf_
On 2016/7/6 19:38, Jiri Olsa wrote:
On Mon, Jul 04, 2016 at 06:20:06AM +, Wang Nan wrote:
SNIP
+static void
+record__toggle_overwrite_evsels(struct record *rec,
+ enum overwrite_evt_state state)
+{
+ struct perf_evlist *evlist = rec->overwrite_evlist;
On 2016/7/6 19:36, Jiri Olsa wrote:
On Mon, Jul 04, 2016 at 06:20:03AM +, Wang Nan wrote:
SNIP
+struct perf_evlist *perf_evlist__new_aux(struct perf_evlist *parent)
+{
+ struct perf_evlist *evlist;
+
+ if (perf_evlist__is_aux(parent)) {
+ pr_err("Internal error:
On 2016/7/6 20:34, Jiri Olsa wrote:
On Wed, Jul 06, 2016 at 08:03:28PM +0800, Wangnan (F) wrote:
On 2016/7/6 19:38, Jiri Olsa wrote:
On Mon, Jul 04, 2016 at 06:20:06AM +, Wang Nan wrote:
SNIP
+static void
+record__toggle_overwrite_evsels(struct record *rec
On 2016/7/8 1:58, Brendan Gregg wrote:
On Thu, Jul 7, 2016 at 10:54 AM, Brendan Gregg
wrote:
On Wed, Jul 6, 2016 at 6:49 PM, Wangnan (F) wrote:
On 2016/7/7 4:29, Brendan Gregg wrote:
G'Day,
Are perf bpf examples shared anywhere? I've seen many posted to lkml
(by Wang Nan),
On 2016/7/8 15:57, Brendan Gregg wrote:
On Thu, Jul 7, 2016 at 9:18 PM, Wangnan (F) wrote:
On 2016/7/8 1:58, Brendan Gregg wrote:
On Thu, Jul 7, 2016 at 10:54 AM, Brendan Gregg
wrote:
On Wed, Jul 6, 2016 at 6:49 PM, Wangnan (F) wrote:
[...]
... Also, has anyone looked into perf
On 2016/7/13 22:06, Jiri Olsa wrote:
On Tue, Jul 12, 2016 at 10:00:03AM +, Wang Nan wrote:
SNIP
-union perf_event *perf_evlist__mmap_read_forward(struct perf_evlist *evlist,
int idx)
+union perf_event *perf_mmap__read_forward(struct perf_mmap *md, bool overwrite)
{
- struct perf
Hi Arnaldo,
Please don't forget this patch.
Thank you.
On 2016/7/19 5:37, Alexei Starovoitov wrote:
On Mon, Jul 18, 2016 at 06:01:08AM +, Wang Nan wrote:
New LLVM will issue newly assigned EM_BPF machine code. The new code
will be propogated to glibc and libelf.
This patch introduces the
On 2016/7/1 5:00, Arnaldo Carvalho de Melo wrote:
Hi Wang,
I booted a machine with the f24 distro kernel and the backward
ring buffer test started FAILing, when it should've noticed that the
kernel doesn't support it and Skip instead:
[root@jouet ~]# perf test -v backward
45: Test bac
Hi Eric,
Are you still working in this patch set?
Now I know why maps section is not a simple array
from a patch set from Joe Stringer:
https://www.mail-archive.com/netdev@vger.kernel.org/msg135088.html
So I think this patch is really useful.
Are you going to resend the whole patch set? If no
Hi Eric,
During testing this patch I find a segfault, please see inline comment.
In addition, since both the BPF map array and map names should be done
after symbol table is collected, merging bpf_object__init_maps and
bpf_object__init_maps_name would be a good practice, making code
simpler.
So
On 2016/11/17 1:43, Joe Stringer wrote:
The tools version of this header is out of date; update it to the latest
version from the kernel headers.
Signed-off-by: Joe Stringer
---
v2: No change.
---
tools/include/uapi/linux/bpf.h | 51 ++
1 file change
I'm also working on improving bpf.c. Please have a look at:
https://lkml.org/lkml/2016/11/14/1078
Since bpf.c is simple, I think we can add more functions and fixes
gradually, instead of a full copy.
See my inline comment below.
On 2016/11/17 1:43, Joe Stringer wrote:
Extend the tools/ versio
On 2016/11/17 10:46, Joe Stringer wrote:
On 16 November 2016 at 18:10, Wangnan (F) wrote:
I'm also working on improving bpf.c. Please have a look at:
https://lkml.org/lkml/2016/11/14/1078
Since bpf.c is simple, I think we can add more functions and fixes
gradually, instead of a full
On 2016/11/15 12:05, Wang Nan wrote:
Add more BPF map operations to libbpf.
Signed-off-by: Wang Nan
Cc: Alexei Starovoitov
Cc: Arnaldo Carvalho de Melo
Cc: Li Zefan
---
tools/lib/bpf/bpf.c | 56 +
tools/lib/bpf/bpf.h | 7 +++
2 f
On 2016/11/17 10:46, Joe Stringer wrote:
On 16 November 2016 at 18:10, Wangnan (F) wrote:
I'm also working on improving bpf.c. Please have a look at:
https://lkml.org/lkml/2016/11/14/1078
Since bpf.c is simple, I think we can add more functions and fixes
gradually, instead of a full
On 2016/10/6 7:20, Arnaldo Carvalho de Melo wrote:
Em Mon, Sep 26, 2016 at 07:26:54AM +, Wang Nan escreveu:
This patch add builtin clang, allow perf compile BPF scripts on the fly.
This is the first step to implement what I announced at LinuxCon 2016 NA:
Ok, so I refreshed this series to
On 2016/10/7 4:18, Arnaldo Carvalho de Melo wrote:
Em Wed, Oct 05, 2016 at 12:47:10PM -0700, Andi Kleen escreveu:
From: Andi Kleen
This is a generic bug fix, but it helps with Sukadev's JSON event tree
where such events can happen.
Any event inclduing a .c/.o/.bpf currently triggers BPF com
On 2016/11/15 12:05, Wang Nan wrote:
$ sudo -s
# ulimit -l unlimited
# perf record -e ./count_syscalls.c echo "Haha"
Start count, perfpid=25209
Haha
[ perf record: Woken up 1 times to write data ]
syscall 8count: 6
syscall 11 count: 1
syscall 4count: 6
sy
On 2016/11/15 12:57, Alexei Starovoitov wrote:
On Mon, Nov 14, 2016 at 8:05 PM, Wang Nan wrote:
This is version 2 of perf builtin clang patch series. Compare to v1,
add an exciting feature: jit compiling perf hook functions. This
features allows script writer report result through BPF map in
On 2016/11/15 13:21, Alexei Starovoitov wrote:
On Mon, Nov 14, 2016 at 9:03 PM, Wangnan (F) wrote:
On 2016/11/15 12:57, Alexei Starovoitov wrote:
On Mon, Nov 14, 2016 at 8:05 PM, Wang Nan wrote:
This is version 2 of perf builtin clang patch series. Compare to v1,
add an exciting feature
On 2016/10/21 15:06, Michael Kerrisk (man-pages) wrote:
Hello Wangnan,
The patch below seems to have landed in Linux 4.7,
commit 86e7972f690c1017fd086cdfe53d8524e68c661c
Could you draft a man-pages patch for this interface
change, please? Or, failing that, a plain-text
description that we can
On 2016/10/22 18:05, Michael Kerrisk (man-pages) wrote:
On 10/21/2016 11:25 PM, Vince Weaver wrote:
On Fri, 21 Oct 2016, Wang Nan wrote:
context_switch : 1, /* context switch data */
-
- __reserved_1 : 37;
+ write_backward : 1, /* Write ring buffer from en
On 2016/11/27 1:25, Alexei Starovoitov wrote:
On Sat, Nov 26, 2016 at 07:03:38AM +, Wang Nan wrote:
getBPFObjectFromModule() is introduced to compile LLVM IR(Module)
to BPF object. Add new testcase for it.
Test result:
$ ./buildperf/perf test -v clang
51: Test builtin clang support
On 2016/11/27 1:29, Alexei Starovoitov wrote:
On Sat, Nov 26, 2016 at 07:03:44AM +, Wang Nan wrote:
PerfModule::doJIT JIT compile perfhook functions and saves result into
a map. Add a test case for it.
At this stage perfhook functions can do no useful things because they
can't invoke exte
On 2016/11/27 1:17, Alexei Starovoitov wrote:
On Sat, Nov 26, 2016 at 07:03:34AM +, Wang Nan wrote:
Add basic clang support in clang.cpp and test__clang() testcase. The
first testcase checks if builtin clang is able to generate LLVM IR.
tests/clang.c is a proxy. Real testcase resides in
u
On 2016/11/28 14:32, Wangnan (F) wrote:
On 2016/11/27 1:25, Alexei Starovoitov wrote:
On Sat, Nov 26, 2016 at 07:03:38AM +, Wang Nan wrote:
getBPFObjectFromModule() is introduced to compile LLVM IR(Module)
to BPF object. Add new testcase for it.
Test result:
$ ./buildperf/perf test
On 2017/1/3 16:19, Jiri Olsa wrote:
hi,
adding a way to configure switch data output
for size and time, like:
$ sudo perf record -e 'sched:*' --switch-output=10M -avg
callchain: type FP
switch-output with 10M size threshold
mmap size 528384B
[ perf record: dump data: Woken up 37
Hi Mathieu,
I meet problems caused by your commit d52c9750f150 ('coresight:
reset "enable_sink" flag when need be'). Not only the one I
posted in the previous patch.
My use case is a simple 'perf record -e cs_etm// ls'. It works
properly before this commit, and failed when allocating aux buffer
On 2016/12/2 23:44, Arnaldo Carvalho de Melo wrote:
Em Sat, Nov 26, 2016 at 07:03:34AM +, Wang Nan escreveu:
Add basic clang support in clang.cpp and test__clang() testcase. The
first testcase checks if builtin clang is able to generate LLVM IR.
tests/clang.c is a proxy. Real testcase res
On 2016/12/5 10:36, Wangnan (F) wrote:
On 2016/12/2 23:44, Arnaldo Carvalho de Melo wrote:
Em Sat, Nov 26, 2016 at 07:03:34AM +, Wang Nan escreveu:
Add basic clang support in clang.cpp and test__clang() testcase. The
first testcase checks if builtin clang is able to generate LLVM IR
On 2016/12/9 10:46, Joe Stringer wrote:
Fixes the following issue when building without access to 'u32' type:
./tools/lib/bpf/bpf.h:27:23: error: unknown type name ‘u32’
Signed-off-by: Joe Stringer
---
v3: Split from "tools lib bpf: Sync with samples/bpf/libbpf"
---
tools/lib/bpf/bpf.c | 4
On 2016/12/9 10:46, Joe Stringer wrote:
The map_flags argument to bpf_create_map() was previously not exposed.
By exposing it, users can access flags such as whether or not to
preallocate the map.
Signed-off-by: Joe Stringer
Please mention commit 6c90598174322b029e40dd84a4eb01f56afe in
On 2016/12/9 10:46, Joe Stringer wrote:
Now that libbpf under tools/lib/bpf/* is synced with the version from
samples/bpf, we can get rid most of the libbpf library here.
Signed-off-by: Joe Stringer
---
v3: First post.
---
samples/bpf/Makefile | 60 +-
samples/bp
On 2016/12/9 13:04, Wangnan (F) wrote:
On 2016/12/9 10:46, Joe Stringer wrote:
[SNIP]
diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
index 62d89d50fcbd..616bd55f3be8 100644
--- a/tools/lib/bpf/Makefile
+++ b/tools/lib/bpf/Makefile
@@ -149,6 +149,8 @@ CMD_TARGETS
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