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arm64 uprobes support showing signs of life
- From: William Cohen <wcohen at redhat dot com>
- To: systemtap at sourceware dot org, Pratyush Anand <panand at redhat dot com>, "arm at lists dot fedoraproject dot org" <arm at lists dot fedoraproject dot org>
- Date: Mon, 05 Jan 2015 11:06:11 -0500
- Subject: arm64 uprobes support showing signs of life
- Authentication-results: sourceware.org; auth=none
Hi All,
Pratyush has been implementing uprobes support for aarch64 and has
posted a set of patches
(http://comments.gmane.org/gmane.linux.ports.arm.kernel/382237) for
review. The really new Linux kernels requires a patch to the
systemtap runtime because the f_dentry macro has been removed. With
the patched systemtap I was able to run the systemtap testsuite and
get some test results exercising the uprobes support:
https://web.elastic.org/~dejazilla/viewsummary.php?summary=%3D%27%3C54A9E21C.2080504%40redhat.com%3E%27
There looked to be a localized fixes for plt support to eliminate the
unsupported systemtap.base/list.exp plt-* tests.
A number of the tests appear to fail because of userspace arguments
cannot be found for sdt probes.
The uprobe patches still need some refinement. On a number of
systemtap "make installcheck" runs the kernel would get stuck spewing
out:
Unexpected kernel single-step exception at EL1
However, things are looking better for user-space probing on arm64.
-Will