[Bug 1248289] [NEW] Missing libunwind support in perf
Public bug reported: Hi, I'm trying to use perf's libunwind support in 13.04 with kernel 3.11.0-12-generic on amd64. Typically you can do this by using the "-g dwarf" flag, but it appears the perf command included in linux- tools-3.11.0-12-generic was not compiled with libunwind. This may be as simple as the build machine didn't have libunwind installed. Having dwarf support in perf with default Ubuntu kernels would be very useful as it provides a way to get profiling information when -fomitframepointer is used. Relevant upstream code: https://github.com/torvalds/linux/blob/v3.11/tools/perf/Makefile#L459 https://github.com/torvalds/linux/blob/v3.11/tools/perf/builtin-record.c#L758 Let me know if I can provide any other information. ** Affects: linux (Ubuntu) Importance: Undecided Status: Triaged -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1248289 Title: Missing libunwind support in perf To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1248289/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1248289] Re: Missing libunwind support in perf
jtaylor: Yep, this is saucy. Just upgraded in fact for the newer stock kernel and hoping that dwarf support would be there. :) I work on Ceph at Inktank and there are times when we are debugging customer clusters with stock kernels where having unwind support in perf would be very useful. It would be especially nice if we could get it working before 14.04 lands as I expect a lot of people will be standardizing on that in the future. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1248289 Title: Missing libunwind support in perf To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1248289/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1248289] Re: Missing libunwind support in perf
Hi Tim, Sorry to respond so late to this, hadn't seen your question earlier and have been bogged down with holidays. I've not seen -g dwarf work yet in a stock ubuntu kernel, but have seen it work in custom kernel compiles. Unfortunately I don't have any raring machines handy at the moment to verify jtaylor's observation that it worked in the stock distribution there. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1248289 Title: Missing libunwind support in perf To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1248289/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 68103] Re: [Edgy]Swap isn't mounted while booting
Hello I've seen exactly the same problem since upgrading to edgy from Dapper (machine is a T43 IBM laptop). When the machine boots it complains that the swap partition (in my case /dev/sda10) is not in the correct format, formating using the command mkswap -v1 /dev/sda10 and swapon -a enables swap. Under Dapper I was able to hibernate the machine and it would recover, under edgy once I enable swap in the manner discribed above I can suspend the machine but it will not recover, it just reboots. Mark. -- [Edgy]Swap isn't mounted while booting https://launchpad.net/bugs/68103 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 68103] Re: [Edgy]Swap isn't mounted while booting
One thing to note, I have /dev/sda10 as my device in /etc/fstab -- [Edgy]Swap isn't mounted while booting https://launchpad.net/bugs/68103 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 68103] Re: [Edgy]Swap isn't mounted while booting
Hi I came across this fix in another bug, it worked for me - https://launchpad.net/distros/ubuntu/+bug/66637 Mark. -- [Edgy]Swap isn't mounted while booting https://launchpad.net/bugs/68103 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2064999] Re: Prevent soft lockups during IOMMU streaming DMA mapping by limiting nvme max_hw_sectors_kb to cache optimised size
Hey folks, I think we may have encountered this or a variant of this while running extremely strenuous Ceph performance tests on a very high speed cluster we designed for a customer. We have a write-up that includes a section on needing to disable iommu here: https://ceph.io/en/news/blog/2024/ceph-a-journey-to-1tibps/ Good job figuring this one out to everyone involved! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2064999 Title: Prevent soft lockups during IOMMU streaming DMA mapping by limiting nvme max_hw_sectors_kb to cache optimised size To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2064999/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
