similar to: Use of the C++ standard library in XRay compiler-rt

On Wed, Mar 8, 2017 at 2:28 PM Tim Shen <timshen at google.com> wrote: > On Wed, Mar 8, 2017 at 1:49 PM David Blaikie <dblaikie at gmail.com> wrote: > > So I stumbled across an issue that I think is a bit fundamental: > > The xray runtime uses the C++ standard library. > > This seems like a problem because whatever C++ standard library is used to > compile the

On Sun, Mar 12, 2017, 4:10 PM Dean Michael Berris <dean.berris at gmail.com> wrote: > > > On 9 Mar 2017, at 09:32, David Blaikie via llvm-dev < > llvm-dev at lists.llvm.org> wrote: > > > > I agree that we should clean up the standard library usage even just for > consistency. > > > > +1 -- now that I think about it, it should be fairly doable

On Tue, Mar 14, 2017 at 5:34 PM Dean Michael Berris <dean.berris at gmail.com> wrote: > On 13 Mar 2017, at 15:39, David Blaikie <dblaikie at gmail.com> wrote: > > > > On Sun, Mar 12, 2017, 4:10 PM Dean Michael Berris <dean.berris at gmail.com> > wrote: > > > > On 9 Mar 2017, at 09:32, David Blaikie via llvm-dev < > llvm-dev at

I'm still somewhat unclear about what you mean by "metadata record entry at the beginning of the block". I understand that I can make a MetadataRecord that contains the pid/tid since a metadata record contains 16 bytes. However, I don't understand what do you mean by the "beginning of the block". Do you mean right after the file header? My understanding is that at

Hello, I am initializing FDR mode and finalizing/flushing the buffers manually. XRay does not log calls from the main thread unless there is a function call after __xray_log_finalize(). This behavior is abnormal since one would expect the trace file to contain all function calls made up to the point when __xray_log_finalize() is called. To demonstrate this behavior, I have taken the test case

# Objective Implement an XRay mode 'xray-profiling' that gathers stack trace latencies/durations and builds histograms to provide basic statistics about where time is going in an execution of the application. # Background XRay has two modes currently implemented in compiler-rt: a basic (nee naive) mode and flight data recorder (FDR) mode. Basic mode logging, when enabled, will collect

FYI: Patch is now available for review in https://reviews.llvm.org/D44620. On Thu, Feb 15, 2018 at 1:34 PM Dean Michael Berris <dean.berris at gmail.com> wrote: > # Objective > > Implement an XRay mode 'xray-profiling' that gathers stack trace > latencies/durations and builds histograms to provide basic statistics about > where time is going in an execution of the

Hello, Also, I’ve noticed that FDR mode doesn’t flush to a log unless programmatically configured to do so unlike basic mode, which flushes by default. Would it be possible to add this feature as well? Thanks, Henry -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20180611/295c3dba/attachment.html>

On Sat, 3 Jun 2017 16:04:57 -0700 Tim Northover <t.p.northover at gmail.com> wrote: [snip] > I think you should be able to fix it by changing the > compiler-rt/lib/xray/test/CMakeLists.txt. If you find the > "add_compiler_rt_test" call and move "-lstdc++" to the end, just after > "-lrt" it should work. Thanks, Tim. I don't see "-lrt":

I would be happy to help. Could you send me the example patch? Where would I submit my patch to be reviewed? Thanks, Henry On Mon, Jun 11, 2018 at 8:31 PM, Dean Michael Berris <dean.berris at gmail.com> wrote: > > > > On 12 Jun 2018, at 07:49, Henry Zhu via llvm-dev < > llvm-dev at lists.llvm.org> wrote: > > > > Hello, > > > > > > I’ve

On 10/3/14 10:16 AM, Dan Albert wrote: >> >> I try to build libc++ and libc++abi for host x86_64(linux) and target >> arm(linux) but fail. >> > > Failing in what way? If this isn't working out of the box, we've done > something wrong. Yeah, it would help to know more specifics about where you're getting stuck. > > jroelofs might know more... For

Hello, There seems to be a bug with the value of the thread ID (TID) that is generated by XRay when calling fork(). The value of the TID of the child has the same TID as its parent (this is seen in the “thread: “ field of the YAML output produced by the llvm-xray tool). This is a problem as the trace generated contains the same TID for the parent and children processes, making it difficult to

Hello, I’ve noticed that XRay does not report the PID in the trace log. Could this be added for multi-process support? (Maybe as a command line argument). Thanks, Henry -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20180611/f800c333/attachment.html>

Hi llvm-dev, Recently, we've committed the beginnings of the llvm-xray [0] tool which allows for conveniently working with both XRay-instrumented libraries as well as XRay trace/log files. In the course of the review for the conversion tool [1] which turns a binary/raw XRay log file into YAML for human consumption purposes, a question arose as to how we intend to allow users to develop tools

Hi, The following three patches, when applied cleanly to LLVM+Clang+compiler-rt will now allow for building and running binaries with a very simple version of XRay included: http://reviews.llvm.org/D21612 (compiler-rt) http://reviews.llvm.org/D20352 (clang) http://reviews.llvm.org/D19904 (llvm) To use this on x86_64-unknown-linux-gnu you'd need to set the flags '-fxray-instrument'

On Wed, Nov 30, 2016 at 3:26 AM Renato Golin <renato.golin at linaro.org> wrote: > On 30 November 2016 at 05:08, Dean Michael Berris via llvm-dev > <llvm-dev at lists.llvm.org> wrote: > > - Is there a preference between the two options provided above? > > - Any other alternatives we should consider? > > - Which parts of which options do you prefer, and is there

Hi cschen, It seems that libunwind (the one included in libcxxabi) is mandatory at the moment. Use the second build command instead: $ CROSS_COMPILING=arm ENABLE_LIBUNWIND=1 ./scripts/compile-all.sh Logan On Tue, Oct 7, 2014 at 5:32 PM, gamma_chen <gamma_chen at yahoo.com.tw> wrote: > After do "sudo apt-get update", the following are pass. > > Install the

Hmm. Odd. I just rebuilt from scratch and it seems to work with the test/CodeGen/X86/xray-attribute-instrumentation.ll test case outputing straight to obj: llc -filetype=obj -o ~/a.o -mtriple=x86_64-apple-macosx < test/CodeGen/X86/xray-attribute-instrumentation.ll What test case are you using? In any case, the issue appears to be that llvm doesn't realize that the target address is

Thanks Nirav, I can confirm that this works when I do the compile with llc, but then when linking to an executable with clang (patched with http://reviews.llvm.org/D20352 and compiler-rt patched with http://reviews.llvm.org/D21612) on Linux, I'm getting something different. Here's a sample of the transcript, and what I'm seeing: --->8 clang invocation 8<--- [16-06-23 3:33:42]

On Wed, Jun 22, 2016 at 6:05 AM Nirav Davé <niravd at google.com> wrote: > This appears to work: > > auto Target = OutContext.createLinkerPrivateTempSymbol(); > > with > > auto Target = OutContext.createTempSymbol(); > > -Nirav > > Thanks Nirav -- I tried this but I'm still getting a "jmpq <address>" with this incantation when I load and