linux-kernel - Re: [PATCH] rbtree: avoid generating code twice for the cached versions

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Date:   Fri, 28 Jun 2019 10:14:16 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     Michel Lespinasse <walken@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        David Howells <dhowells@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rbtree: avoid generating code twice for the cached
 versions

On Thu, 27 Jun 2019, Michel Lespinasse wrote:

>As was already noted in rbtree.h, the logic to cache rb_first (or rb_last)
>can easily be implemented externally to the core rbtree api.
>
>Change the implementation to do just that. Previously the update of
>rb_leftmost was wired deeper into the implemntation, but there were
>some disadvantages to that - mostly, lib/rbtree.c had separate
>instantiations for rb_insert_color() vs rb_insert_color_cached(), as well
>as rb_erase() vs rb_erase_cached(), which were doing exactly the same
>thing save for the rb_leftmost update at the start of either function.

Also:

   text	   data	    bss	    dec	    hex	filename
   5405	    120	      0	   5525	   1595	lib/rbtree.o-vanilla
   3827	     96	      0	   3923	    f53	lib/rbtree.o-patch