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[2003:d9:9719:9800:9e1a:e620:ab52:a3b7]) by smtp.googlemail.com with ESMTPSA id n3sm12780169wmi.7.2021.04.25.00.52.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 25 Apr 2021 00:52:21 -0700 (PDT) From: Manfred Spraul To: LKML , Davidlohr Bueso , Andrew Morton Cc: 1vier1@web.de, Manfred Spraul Subject: [PATCH 0/1] ipc/util.{c,h}: Use binary search for max_idx Date: Sun, 25 Apr 2021 09:52:07 +0200 Message-Id: <20210425075208.11777-1-manfred@colorfullife.com> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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