linux-kernel - Re: [PATCH -tip 0/7] tools/perf: Update rbtree implementation and optimize users

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Date:   Mon, 27 Nov 2017 08:14:57 -0800
From:   Davidlohr Bueso <dave@...olabs.net>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     acme@...nel.org, jolsa@...hat.com, mingo@...hat.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH -tip 0/7] tools/perf: Update rbtree implementation and
 optimize users

On Sun, 26 Nov 2017, Andi Kleen wrote:

>> Applies on today's -tip tree. Please consider for v4.16.
>
>No numbers on the improvements?

I have not done performance tests perse for perf, but ultimately
it will depend a lot on the workload and size of the tree. I had
previously measured, on a Xeon E5-2450 @ 2.10GHz, the cost of
an rb_first() was ~60 cycles for 100 nodes, and ~75 cycles with
1000 nodes. fwiw.

Thanks,
Davidlohr