From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 6A05D47799E; Thu, 24 Sep 2026 11:32:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790249567; cv=none; b=ZUGEa5YZyNpY2bXHqAxAzWcSikQ5I5XhAnHggXPgI7U51U77vx7xK4wxBbV4p51i7E7zzc5NJ15iBgvQDYqUJ7L0WQ0PoOuT0z+4w61q685uv7bM55A799VgjBdEIaT7mOI7q48zLRCzd82VjN2u+u4xyBUWljUTZavxAt043BY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790249567; c=relaxed/simple; bh=DLlsBqo0eMS+6mNCW0A3yo26qVE4Z8SudAU2wMXXblo=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=Dv8YrrqNS9hY3sZO6CaxanGxLHe2kB/u8wV6DCJiRSUMVPnI+rTCCx86+A1dn1KrFmJAiSqjEcDk/xnOD35zs48NZLbTDEXSAcHOJ2KTveKcpQSQAjch7iAb/RfSoEp6wI6RiaQx8myted8ydr+ziXMlfqwjY0S2s3COFiUM9M4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=XSoPi3ry; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="XSoPi3ry" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D5D2E1F000FF; Thu, 24 Sep 2026 11:32:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790249551; bh=cQj9D8x4oEPB7huvIPsbaucEe6zKoS2sjeEUT0tAQCI=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=XSoPi3ryBulL5yHm+JAZdpDmXLrr9wQ1M3T1ZlEhgWVgsGlYKjxFDZBFvYCZ7nsOT H3ipKCg+yeX9+ER9/1OEaMf9qS9tIzofbR2CD6T+XXzQ+VbD+JE/uTMJA4+7/wTXhC Wii4PSEJUEfEq4j3cwHX4HkKmklrqUyTAEJKTVAmAifjnzRkTbU0IKQWdOOkZ093eD hcAcNtr8uO4q89+C3cs0DaJ2k6Vhjz4ceLsgzs73AEDX96WEYw70NA2dn35QgyvHS7 Y27tHYQhwBsJMr9Y38I9JakIxF6rICjFL1qvNuC3vzo/IRLtVWmr8Tjw6sbFh5+Etl 7YwYR8c534qAw== Message-ID: Date: Thu, 24 Sep 2026 13:32:25 +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 01/10] selftests/mm: exercise MADV_COLD and MADV_PAGEOUT To: "Lorenzo Stoakes (ARM)" , Gregory Price Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, kernel-team@meta.com, akpm@linux-foundation.org, liam@infradead.org, vbabka@kernel.org, jannh@google.com, rppt@kernel.org, surenb@google.com, mhocko@suse.com, shuah@kernel.org References: <20260922235830.2350770-1-gourry@gourry.net> <20260922235830.2350770-2-gourry@gourry.net> 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 9/23/26 16:46, Lorenzo Stoakes (ARM) wrote: > On Wed, Sep 23, 2026 at 10:44:17AM -0400, Gregory Price wrote: >> On Wed, Sep 23, 2026 at 03:26:05PM +0100, Lorenzo Stoakes (ARM) wrote: >>> >>> I think in general we want to avoid putting stress tests as part of the >>> selftests in general? Or at least if they might take a long time to run or >>> excessive memory usage, etc. >>> >>> Though that might be benchmarks, as we have the THP stress tests so maybe it's >>> OK? >>> >>> >>> In any case I really do think this should be split out into smaller parts, this >>> is a _gigantic_ change :) >>> >> >> Absolutely, but alas my poor email hosting throttles me if i send too >> many emails - and sending a 38-part series where the important part is >> the endpoint of the refactor moreso than the individual tests... >> instant 24-hour timeout. >> >> I'm working on a solution. Need better hosting. > > Thanks! But yeah damn indeed you do! :) > > Though larger series can scare people off so maybe better to send the tests > separately? In any case, we have to break this down into reviewable pieces. We neglected selftests for too long. ... and there are some schlopped tests in there that we really shouldn't have as they are way too special and hard to maintain. Like this monstrosity: +/* + * A folio faulted on another CPU can remain in that CPU's pending LRU batch. + * MADV_COLD drains only the calling CPU and must safely skip the non-LRU + * folio without changing the mapping. + */ +static void test_madvise_cold_remote_lru_batch(void) +{ -- Cheers, David