b129c7dea2
In map_head_and_body_twice(), the second mmap call fails: mmap2(NULL, 135168, PROT_READ|PROT_WRITE, MAP_SHARED, 3, 0) = 0xf64a2000 mmap2(0xf64b3000, 65536, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_FIXED, 3, 0x1000) = -1 EINVAL (Invalid argument) Due to cache issues, all shared mapping of a page must be equivalently mapped. This requires page mappings to be at the same virtual address modulo 4 MB. Due to a kernel limitation, all mappings to a file must be equivalent. The test can be fixed by rounding the buffer_size used in the mapped ring buffer to 4 MB on hppa. This makes the two mmap mappings equivalent. Bug-Debian: https://bugs.debian.org/1021853
Sysprof is a sampling profiler that uses a kernel module to generate stacktraces which are then interpreted by the userspace program "sysprof".
See the Sysprof homepage for more information.
Merge requests and bug reports should be sent to sysprof's repository on GNOME's GitLab instance. For general discussion and questions, you can create a new topic in GNOME's Discourse.
The former mailing list is archived in https://mail.gnome.org/archives/sysprof-list/.
Debugging symbols
The programs and libraries you want to profile should be compiled
with -fno-omit-frame-pointer and have debugging symbols available,
or you won't get much usable information.
Building Sysprof
You need some packages installed. The package names may vary depending on your distribution, the following command works on Fedora 36:
sudo dnf install gcc gcc-c++ ninja-build gtk4-devel libadwaita-devel
Then do the following:
meson --prefix=/usr build
cd build
ninja
sudo ninja install
WARNING: ninja install will mostly install under the configured install
prefix but installs systemd service configuration directly in the system
default location /usr/lib/systemd so it won't work without root privileges,
even if the install prefix is a user-owned directory.