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https://github.com/varun-r-mallya/sysprof.git
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1bd79af439
This provides a new sysprof-live-unwinder subprocess that runs as root to allow accessing all processes on the system via /proc/$pid/. It is spawned by sysprofd with various perf event FDs and a FD to write captures to. Ideally the capture_fd is something that will naturally error if the client application crashes (such as a socketpair() having the peer close). This is not enforced but encouraged. Additionally, an event_fd is used to allow the client application to signal the live-unwinder to exit. Unwinding is performed by looking at the modules loaded into the target pid and using libdwfl to access DWARF/CFI/etc state machinery. Stack data does not touch the disk as it exists in a mmap buffer from perf and is then translated into a callchain and sent to the Sysprof client. Unwinding occurs as normal post-mortem though is improved through the use of debuginfod to locate the appropriate symbols.
24 lines
961 B
XML
24 lines
961 B
XML
<!DOCTYPE node PUBLIC "-//freedesktop//DTD D-BUS Object Introspection 1.0//EN"
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"http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd">
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<node>
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<interface name="org.gnome.Sysprof3.Unwinder">
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<!--
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Unwind:
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@stack_size: the size of stacks that are sampled
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@perf_fds: an array of (perf_fd, CPU number)
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@event_fd: an event fd to write to for notifying unwinder should exit
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@capture_fd: (out): a FD that will be written to containing samples
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Unwinding will stop when capture_fd can no longer be written to
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such as being closed by the consumer of this API.
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-->
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<method name="Unwind">
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<annotation name="org.gtk.GDBus.C.UnixFD" value="true"/>
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<arg type="u" name="stack_size" direction="in"/>
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<arg type="a(hi)" name="perf_fds" direction="in"/>
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<arg type="h" name="event_fd" direction="in"/>
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<arg type="h" name="capture_fd" direction="out"/>
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</method>
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</interface>
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</node>
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