linux-kernel - Re: [PATCH 0/4] percpu: add basic stats and tracepoints to percpu allocator

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Message-ID: <20170620174521.GD21326@htj.duckdns.org>
Date:   Tue, 20 Jun 2017 13:45:21 -0400
From:   Tejun Heo <tj@...nel.org>
To:     Dennis Zhou <dennisz@...com>
Cc:     Christoph Lameter <cl@...ux.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH 0/4] percpu: add basic stats and tracepoints to percpu
 allocator

On Mon, Jun 19, 2017 at 07:28:28PM -0400, Dennis Zhou wrote:
> There is limited visibility into the percpu memory allocator making it hard to
> understand usage patterns. Without these concrete numbers, we are left to
> conjecture about the correctness of percpu memory patterns and usage.
> Additionally, there is no mechanism to review the correctness/efficiency of the
> current implementation.
> 
> This patchset address the following:
> - Adds basic statistics to reason about the number of allocations over the
>   lifetime, allocation sizes, and fragmentation.
> - Adds tracepoints to enable better debug capabilities as well as the ability
>   to review allocation requests and corresponding decisions.
> 
> This patchiest contains the following four patches:
> 0001-percpu-add-missing-lockdep_assert_held-to-func-pcpu_.patch
> 0002-percpu-migrate-percpu-data-structures-to-internal-he.patch
> 0003-percpu-expose-statistics-about-percpu-memory-via-deb.patch
> 0004-percpu-add-tracepoint-support-for-percpu-memory.patch

Applied to percpu/for-4.13.  I had to update 0002 because of the
recent __ro_after_init changes.  Can you please see whether I made any
mistakes while updating it?

 git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu.git for-4.13

Thanks.

-- 
tejun