On Fri, Jan 17, 2014 at 11:21:23AM +0100, Mauro Andreolini wrote: > Hi all,
hi > > No kallsyms or vmlinux with build-id 4c6ab941f31dde04c2a481430218994849927c8d > was found > [ext4] with build id 4c6ab941f31dde04c2a481430218994849927c8d not found, > continuing without symbols > No kallsyms or vmlinux with build-id 21f163b0a8a8b924efdd173b8f83ad723d378958 > was found > [drm] with build id 21f163b0a8a8b924efdd173b8f83ad723d378958 not found, > continuing without symbols > No kallsyms or vmlinux with build-id d0bd7dd69886c2dccde18dee760b6d39cc0b5a55 > was found[qxl] with build id d0bd7dd69886c2dccde18dee760b6d39cc0b5a55 not > found, continuing without symbols > No kallsyms or vmlinux with build-id 8d13e6f0c4d4f8b4628c8c4bd6c660b0a00576df > was found[ttm] with build id 8d13e6f0c4d4f8b4628c8c4bd6c660b0a00576df not > found, continuing without symbols hum, do you have kernel-debuginfo* packages installed? SNIP > > Problem n.2: sometimes perf prints bogus callchains (in particular > when the various printf() variants are involved). > > |--1.46%-- 0xffffffffa048a275 > | 0xffffffffa048c110 > | 0xffffffffa04909e7 > | | > | |--80.00%-- 0xffffffffa0490afa > | | 0xffffffffa048ee8b > | | 0xffffffffa048ba8f > | | bit_bmove > | | fbcon_redraw_blit.isra.22 > | | fbcon_scroll > | | scrup > | | lf > | | do_con_trol > | | do_con_write.part.18 > | | con_write > | | do_output_char > | | n_tty_write > | | tty_write > | | vfs_write > | | sys_write > | | system_call_fastpath > | | __GI___libc_write > | | | > | | |--50.00%-- vfprintf > | | | 0x0 <---HERE > | | | > | | |--25.00%-- main > | | | __libc_start_main > | | | _start > | | | 0x0 <---HERE > | | | > | | --25.00%-- 0x7facc1df12a0 HERE this one could be caused by: http://marc.info/?l=linux-kernel&m=134934717011451&w=2 I never managed to push this change through.. need to revisit it ;-) if you want to try, I rebased the patch and put it in here: git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git branch perf/rsp_fix1 commit: https://git.kernel.org/cgit/linux/kernel/git/jolsa/perf.git/commit/?h=perf/rsp_fix1&id=5eed39431f9b1e65e740a2e3e197c79f0a1bcf6b it still fixies some of the backtraces for me jirka -- To unsubscribe from this list: send the line "unsubscribe linux-perf-users" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
