From mboxrd@z Thu Jan 1 00:00:00 1970 From: flboudet@gmail.com (florent boudet) Date: Mon, 29 Nov 2010 22:43:58 -0000 Subject: [ltt-dev] Kernel and User Space tracers have different timestamp reference In-Reply-To: <4CEFBA7A.8060807@polymtl.ca> References: <20101126082453.4252.72312.launchpad@wampee.canonical.com> <4CEFB138.6030409@polymtl.ca> <20101126133256.GA22133@Krystal> <4CEFBA7A.8060807@polymtl.ca> Message-ID: Hi! Thank you for your answers, I will keep posted for new releases. By the way, LTTng and UST are awesome tools, thank you for the hard work! Florent On Fri, Nov 26, 2010 at 2:47 PM, David Goulet wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Yes, > > And also, the UST patch is done and ready for merge :) > > Very soon guys! > > David > > On 10-11-26 08:32 AM, Mathieu Desnoyers wrote: >> Hi! >> >> Yesterday evening, Julien and I were actively finishing the vDSO work >> that is needed to have synchronized timestamps between the kernel LTTng >> and UST on x86. It should be ready very soon. Keep posted for a new >> release. :) >> >> By the way, in the initial implementation, only 64-bit processes on >> 64-bit x86 systems with synchronized TSCs will benefit from the vDSO >> speed. All other x86 setups will fallback on a system call, which will >> still work, albeit being a bit slower. >> >> Thanks, >> >> Mathieu >> >> * Alexandre Montplaisir (alexandre.montplaisir at polymtl.ca) wrote: >>> Hi folks, >>> >>> I've received this bug report about kernel/UST trace synchronization. >>> Anyone knows what's the status on this? >>> >>> Thanks, >>> Alexandre >>> >>> >>> On 10-11-26 03:24 AM, Florent Boudet wrote: >>>> Hello, >>>> >>>> I am sorry to contact you directly instead of filling a bug, but it >>>> seems the option is disabled on the launchpad project... >>>> >>>> I have recorded userspace traces at the same time as kernel traces, and >>>> opened both with LTTv. >>>> Timestamp for userspace traces and timestamp for kernel traces have >>>> different origins, which make it difficult to analyze. >>>> I am not sure about the cause, this might be related to a GMT/localtime >>>> issue... >>>> >>>> Regards, >>>> Florent Boudet >>> >>> >>> _______________________________________________ >>> ltt-dev mailing list >>> ltt-dev at lists.casi.polymtl.ca >>> http://lists.casi.polymtl.ca/cgi-bin/mailman/listinfo/ltt-dev >>> >> > > - -- > David Goulet > LTTng project, DORSAL Lab. > > 1024D/16BD8563 > BE3C 672B 9331 9796 291A ?14C6 4AF7 C14B 16BD 8563 > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.10 (GNU/Linux) > > iEYEARECAAYFAkzvunoACgkQSvfBSxa9hWP1gQCfTTq08bZsAX5kZd9aL98gTUPJ > 1bsAnRJ2LzczcavguNjeADa5WrtN1MoW > =jWhQ > -----END PGP SIGNATURE----- >