linux-kernel - RE: [PATCH] devcoredump: increase the device delete timeout to 10 mins

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Date:   Tue, 1 Mar 2022 06:48:49 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Abhinav Kumar' <quic_abhinavk@...cinc.com>,
        Johannes Berg <johannes@...solutions.net>,
        Greg KH <gregkh@...uxfoundation.org>
CC:     "rafael@...nel.org" <rafael@...nel.org>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "swboyd@...omium.org" <swboyd@...omium.org>,
        "khsieh@...eaurora.org" <khsieh@...eaurora.org>,
        "nganji@...eaurora.org" <nganji@...eaurora.org>,
        "seanpaul@...omium.org" <seanpaul@...omium.org>,
        "dmitry.baryshkov@...aro.org" <dmitry.baryshkov@...aro.org>,
        "aravindh@...eaurora.org" <aravindh@...eaurora.org>,
        "freedreno@...ts.freedesktop.org" <freedreno@...ts.freedesktop.org>
Subject: RE: [PATCH] devcoredump: increase the device delete timeout to 10
 mins

From: Abhinav Kumar
> Sent: 28 February 2022 21:38
...
> We also did some profiling around how much increasing the block size
> helps and here is the data:
> 
> Block size	cost
> 
> 4KB	        229s
> 8KB	         86s

You must have an O(n^2) operation in there - find it.

	David

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