Hi Zhenyu, Which gcc version do you use ?
(gcc --version) Thanks, Mathieu ----- Original Message ----- > From: "zhenyu.ren" <[email protected]> > To: "lttng-dev" <[email protected]>, "zhenyu.ren" > <[email protected]> > Sent: Monday, February 24, 2014 4:36:36 AM > Subject: Re: [lttng-dev] epoll_wait reboot kernel? > > 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 > > > _______________________________________________ > lttng-dev mailing list > [email protected] > http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev > -- Mathieu Desnoyers EfficiOS Inc. http://www.efficios.com _______________________________________________ lttng-dev mailing list [email protected] http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
