[Bug releng/25581] USDT probes when /proc/[pid]/mem not writeable

[dale.hamel at srvthe dot net]

https://sourceware.org/bugzilla/show_bug.cgi?id=25581

--- Comment #1 from Dale Hamel <dale.hamel at srvthe dot net> ---
This is the first bug I have created on here, hopefully I have submitted it
correctly. If I am out of order at all, please direct me to the right way to
submit this issue / proposal for enhancement.

This patch has been tested in production and works around the dependency on a
semaphore for popular programs like ruby, memcached, mysql, and redis, and for
using USDT probes without impacting performance when not attached.

Thanks for taking the time to review this bug, I look forward to hearing your
feedback and suggestions,
-Dale

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