linux-kernel - Re: [PATCH] percpu: add a schedule point in pcpu_balance

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Message-ID: <20180223165317.GD1641506@devbig577.frc2.facebook.com>
Date:   Fri, 23 Feb 2018 08:53:17 -0800
From:   Tejun Heo <tj@...nel.org>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] percpu: add a schedule point in pcpu_balance_workfn()

On Fri, Feb 23, 2018 at 08:12:42AM -0800, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@...gle.com>
> 
> When a large BPF percpu map is destroyed, I have seen
> pcpu_balance_workfn() holding cpu for hundreds of milliseconds.
> 
> On KASAN config and 112 hyperthreads, average time to destroy a chunk
> is ~4 ms.
> 
> [ 2489.841376] destroy chunk 1 in 4148689 ns
> ...
> [ 2490.093428] destroy chunk 32 in 4072718 ns
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied to percpu/for-4.16-fixes.

Thank, Eric.

-- 
tejun