https://sourceware.org/bugzilla/show_bug.cgi?id=32263
Bug ID: 32263
Summary: RFE: API to create/track executable memory layout for
processes from perf PERF_RECORD_MMAP* events
Product: elfutils
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: general
Assignee: unassigned at sourceware dot org
Reporter: wcohen at redhat dot com
CC: elfutils-devel at sourceware dot org
Target Milestone: ---
The current eu-stacktrace code in development resorts to reading /proc
information to determine which binaries the IP addresses map to when
unwinding the stack. The main disadvantages of reading the /proc
information is for short lived processes the /proc maybe non-existent
and for processes using dlopen/dlclose the information /proc
information might be out of sync with the mmap when the sample was
taken. The approach that Linux perf takes to avoid those problems is
to record changes to the memory map with PERF_RECORD_MMAP and
PERF_RECORD_MMAP2 events. It would be a nice addition to elfutils
tools to have a means of building a picture of a memory map of a
process using the PERF_RECORD_MMAP* events and being able to use that
in other parts of the elfutils such as eu-stacktrace.
The code may still need to read /proc/<pid>/maps to get a
starting point memory map of processes that existed before data
recording started.
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