linux-kernel - [PATCH 0/1] ipc/util.{c,h}: Use binary search for max

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Date:   Sun, 25 Apr 2021 09:52:07 +0200
From:   Manfred Spraul <manfred@...orfullife.com>
To:     LKML <linux-kernel@...r.kernel.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     1vier1@....de, Manfred Spraul <manfred@...orfullife.com>
Subject: [PATCH 0/1] ipc/util.{c,h}: Use binary search for max_idx

2nd version of the patch:
@Andrew: Could you add the patch to your mm tree, as candidate for
linux-next?

Note:
I have tried to remove the ids->max_idx cache entirely. Unfortunately,
this causes a significant slow-down of semstat(,,IPC_STAT):
   * no object allocated, no ipcmni_extended: +50%
   * no object allocated, with ipcmni_extended: +80%
   * 30 objects allocated, with large gaps, no ipcmni_extended:
           +350%
Thus I haven't removed ids->max_id.


--
	Manfred