linux-kernel - Re: [PATCH] clk: make clk_core_lookup faster by using clk name hash

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Message-ID: <163425869104.1688384.2477307279117424281@swboyd.mtv.corp.google.com>
Date:   Thu, 14 Oct 2021 17:44:51 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Mark-PK Tsai <mark-pk.tsai@...iatek.com>, mturquette@...libre.com
Cc:     mark-pk.tsai@...iatek.com, yj.chiang@...iatek.com,
        matthias.bgg@...il.com, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH] clk: make clk_core_lookup faster by using clk name hash

Quoting Mark-PK Tsai (2021-10-04 23:59:49)
> Compare hash value before strcmp the full name to make
> clk_core_lookup faster.
> 
> It make clk driver probe 30 percent faster on the platform
> have 1483 registered clks and average clock name length 20.

Why is clk_core_lookup() a fast path for you?