From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8C4633AC00; Fri, 8 May 2026 20:15:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778271352; cv=none; b=j8PoVgiL8WXR2w0q+/8pLfLepRiWiX4RLTm0lvQWGkncI8N1mIKLH11GQJBoRyvP+2rZMVpir4bH1aLjTYffmZpbkBaVTMnLwx78u/YaS8BPkn17R0Aw6DitULXXUs2E+XoMUhJEd9pzOE39+LWNfLJbNIbdeICZ/Jp4Z0T+jEA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778271352; c=relaxed/simple; bh=xGiqEO6dUYRjURZgOVt3NlrnKCQ+09veWhc+B1Qmc1g=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=JbV4gUH3M9tnwDqsvH5RN+6Bn6OFONXOM5pkSpp51mY9vc0ojDp7IJO9fyyw7uQkfiVHISJ5O1MgHw0JHh3gEQiRgxoZJF0wU1AlUjF/xzjfKle8IzIBgdKQd0MAmV524QQh7y9IEjqmm/APTJCHZR+mHw9uZCkACyZfZAiIKkw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PB1h90kT; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="PB1h90kT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4FC9AC2BCB0; Fri, 8 May 2026 20:15:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1778271352; bh=xGiqEO6dUYRjURZgOVt3NlrnKCQ+09veWhc+B1Qmc1g=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=PB1h90kTQ8mw9ftt+Je/B0oATn04C39/MAJwFEl1bdSwsejISNIjj1BAkpOsdLhCQ IDn8YDBZzL8pNFMum53/tAqWJZXkeCm6hmWtVHRVDLScbQfQHenEUZiCOFlyhDoKJM 65DwL9frz4OrIwIcg7qR65T4EtxBE1rInRqwBiqGzzwrh1qqkw/MkhnJoH2thCptqx omJhxGd/d8Kdcbp2aaVL+w6oSPo5llQMp5f8YzQAFY2RbkchR0rHCsHG+ljHwWCjaI peWENJOAQSdTlckPQR6wFAx41E+qa0bRd9OwyQ5cTu5IoZLca3zz90r3julKwsRTwJ N9jit3OujNGmA== Message-ID: Date: Fri, 8 May 2026 22:15:45 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/2] selftests/mm: add zone->lock tracepoint verification test To: hawk@kernel.org, Andrew Morton , linux-mm@kvack.org Cc: Vlastimil Babka , Steven Rostedt , Suren Baghdasaryan , Michal Hocko , Zi Yan , Lorenzo Stoakes , Shuah Khan , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, kernel-team@cloudflare.com References: <20260508162207.3315781-1-hawk@kernel.org> <20260508162207.3315781-2-hawk@kernel.org> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 5/8/26 18:22, hawk@kernel.org wrote: > From: Jesper Dangaard Brouer > > Add a selftest to verify the kmem:mm_zone_lock_contended, > kmem:mm_zone_locked, and kmem:mm_zone_lock_unlock tracepoints. > > The test has two components: > > zone_lock_contention.c - a workload that spawns threads doing rapid > page allocation and freeing to generate zone->lock contention. It > shrinks PCP lists via percpu_pagelist_high_fraction to force frequent > free_pcppages_bulk() and rmqueue_bulk() calls. > > test_zone_lock_tracepoints.sh - uses bpftrace to verify tracepoints > exist, have the expected fields, fire under load, and that wait_ns > is populated when contention occurs. > > Signed-off-by: Jesper Dangaard Brouer > --- > tools/testing/selftests/mm/Makefile | 2 + > .../mm/test_zone_lock_tracepoints.sh | 212 ++++++++++++++++++ > .../selftests/mm/zone_lock_contention.c | 166 ++++++++++++++ This really looks excessive and ... not really how we usually treat tracepoints? I don't know about others, but I don't think this is really what we want as a MM selftest. -- Cheers, David