[Bug gprofng/29700] New: [display collect] Issue a warning if callstack frames are no longer captured

[ruud.vanderpas at oracle dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29700

            Bug ID: 29700
           Summary: [display collect] Issue a warning if callstack frames
                    are no longer captured
           Product: binutils
           Version: 2.39
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: gprofng
          Assignee: vladimir.mezentsev at oracle dot com
          Reporter: ruud.vanderpas at oracle dot com
  Target Milestone: ---

The data collection engine uses a buffer to store the call stack data. Once the
buffer is full, callstack frames are no longer captured. The default limit is
256 both for C/C++ and Java.

If frames have been dropped, this is shown in the output from "gprofng display
text" (<Truncated-stack>), but it will be helpful to also print a diagnostic
run-time message in case this has occurred.

This message should also explain how to increase the buffer size by changing
the value through environment variables GPROFNG_MAX_CALL_STACK_DEPTH (C/C++) or
GPROFNG_JAVA_MAX_CALL_STACK_DEPTH (Java).

The complication is that this warning should not be sent to stdout/stderr
per-se, or the user needs to have a way to disable these, because perhaps this
behaviour is known and desired.

This is why it might be better to include such a warning in a log file. An
added benefit is that other tools (e.g. display html) may pick this up.

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