[ale] Tool search

[Jerald Sheets]

> On Oct 16, 2020, at 8:25 AM, Ed Cashin via Ale <ale at ale.org> wrote:
> 
> I was watching for responses.  This doesn't sound simple at all to me.
> 
> For a while they were adding dtrace to Linux, and I think Oracle Linux had it.  I don't know whether it made it into the mainline, but if so, you could probably put together what you need using dtrace.  You'd have to consider all the ways (direct IO, minor page faults) bytes can get into RAM, though, and filter out stuff you're not interested in (local disk, etc.).
> 
> If there's no special tool and no dtrace, ftrace might be of interest to you.

There’s “bpftrace”
http://www.brendangregg.com/blog/2018-10-08/dtrace-for-linux-2018.html <http://www.brendangregg.com/blog/2018-10-08/dtrace-for-linux-2018.html>

The OEL version:
https://www.oracle.com/linux/downloads/linux-dtrace.html <https://www.oracle.com/linux/downloads/linux-dtrace.html>

There’s a project:
https://github.com/dtrace4linux/linux <https://github.com/dtrace4linux/linux>

(I like this one.  It’s the actual Oracle DTracefor linux  code, but doesn’t modify the kernel…. It uses a KLM to provide the endpoints instead.



—j
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