Oh,It seems not epoll related . I am using DBG/ERR() as debug way ,but this
print-style method doesn't work as expected,so I mistake for epoll_wait.
It seems gcc problem because if I changed lib_ring_buffer_do_copy as the
following,all work well
#define lib_ring_buffer_do_copy(config, dest, src, len) \
do { \
size_t __len1 = (len); \
/*here , not __len=(len)*/
mdelay(0x135);\
if (__builtin_constant_p(len)) \
memcpy(dest, src, __len1); \
else \
inline_memcpy(dest, src, __len1); \
} while (0)
I disasembled lib_ring_buffer_write() and "vimdiff bad good" shows :
49c: 48 89 da mov %rbx,%rdx
| 49c: 4c 89 f2 mov
%r14,%rdx
here rdx is the 3rd parameter to inline_memcpy().
Thanks
zhenyu.ren
>Hi,lttng-dev
>
> I am working on rhel6(2.6.32.220) and ust is working very well.But when I
> use lttng-modules (after "lttng start"),the kernel reboots immediately
> >without any message output to console.
>
> It took me some days finding out what results in reboot. I shortcut
> __event_probe__##_name() before _tstruct but kernel still reboot(So what left
> is >metadata_printf).If I comment out "mask |= POLLIN" in
> lttng_metadata_ring_buffer_poll() ,kernel do not reboot. What I find out is
> before reboot the >callchain of lttng-consumerd thread is
> consumer_thread_metadata_poll()->lttng_poll_wait(wait for metadata
> stream)->compat_epoll_wait().
>
> I want to use poll instead as epoll in lttng-tools ,I changed lttng-tools
> configure file to not use epoll(undef HAVE_EPOLL),but "lttng enable-event -a
> -k >"failed :(Do I miss anything?)
>#lttng enable-event -a -k
>DEBUG1 [17837/18080]: Wait for client response (in thread_manage_clients() at
>main.c:3709)
>DEBUG1 [17837/18080]: Receiving data from client ... (in
>thread_manage_clients() at main.c:3754)
>DEBUG1 [17837/18080]: Nothing recv() from client... continuing (in
>thread_manage_clients() at main.c:3758)
>DEBUG1 [17837/18080]: Clean command context structure (in clean_command_ctx()
>at main.c:535)
>DEBUG1 [17837/18080]: Accepting client command ... (in thread_manage_clients()
>at main.c:3667)
>DEBUG1 [17837/18080]: Wait for client response (in thread_manage_clients() at
>main.c:3709)
>DEBUG1 [17837/18080]: Receiving data from client ... (in
>thread_manage_clients() at main.c:3754)
>DEBUG1 [17837/18080]: Processing client command 7 (in process_client_msg() at
>main.c:2579)
>DEBUG1 [17837/18080]: Getting session k-test by name (in process_client_msg()
>at main.c:2656)
>DEBUG1 [17837/18080]: Creating kernel session (in create_kernel_session() at
>main.c:2495)
>DEBUG3 [17837/18080]: Created hashtable size 4 at 0x669410 of type 1 (in
>lttng_ht_new() at hashtable.c:112)
>DEBUG1 [17837/18080]: Kernel session created (fd: 21) (in
>kernel_create_session() at kernel.c:109)
>DEBUG3 [17837/18080]: Copying tracing session consumer output in kernel
>session (in copy_session_consumer() at main.c:2393)
>DEBUG3 [17837/18080]: Created hashtable size 4 at 0x66a750 of type 1 (in
>lttng_ht_new() at hashtable.c:112)
>DEBUG3 [17837/18080]: Copy session consumer subdir /kernel (in
>copy_session_consumer() at main.c:2428)
>DEBUG3 [17837/18080]: mkdir() recursive
>/root/lttng-traces/k-test-20140222-131335 with mode 504 for uid 0 and gid 0
>(in run_as_mkdir_recursive() at >runas.c:310)
>DEBUG1 [17837/18080]: Using run_as_clone (in run_as() at runas.c:293)
>lttng-sessiond: ht-cleanup.c:92: thread_ht_cleanup: Assertion `pollfd ==
>ht_cleanup_pipe[0]' failed.
>
> It seems lttng-tools in ubuntu 12.04 is using poll,isnt it?
>
> Does anyone have any suggestions to me ?
>PS:.lttng(ust/module/tool) version is 2.3.0 and urcu version is 0.8
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