From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55])
	(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 8A3B645A2AA
	for <linux-kernel@vger.kernel.org>; Fri, 14 Aug 2026 10:20:03 +0000 (UTC)
Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55
ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;
	t=1786702814; cv=none; b=PgDw/LpZG/ZAcikqhuW7Affs15vIYB51WZ6so7sPxrWpejIN0nWkdN56+NjQsXvMOSZr/TuupeJJddQOW8jq9NsFgt4f9HnLYGRy6qUegirnLCKly3ayRdQnNDgh6e4mIrBW0QvPXliLLRuUWEETGPP7xRS+8597P5jwJJrdQDE=
ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org;
	s=arc-20240116; t=1786702814; c=relaxed/simple;
	bh=vN1Kd/dc5ytTdio69uh40bSXzxKzVPdmTOx6GQLnxHg=;
	h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version:
	 Content-Type:Content-Disposition:In-Reply-To; b=EWWGfWpQXfs4K7ZIw7FCig3XQ3wItA3Rrftx+r1ryI1aclEWnFStUehhcxGBMFY8mnJS86CJnJjJMIk+KO4SJRsRhcGNcgHWsXvsRcvwCXzKtKqxqWXMaqtQKj8C3rGRn3UUnrSpH1dKz1J50T/yelDU75Y7MlY0V+ia50bAY8g=
ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=4zGtVov0; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=19Bgy5OB; arc=none smtp.client-ip=193.142.43.55
Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de
Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de
Authentication-Results: smtp.subspace.kernel.org;
	dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="4zGtVov0";
	dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="19Bgy5OB"
Date: Fri, 14 Aug 2026 12:19:55 +0200
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de;
	s=2020; t=1786702796;
	h=from:from:reply-to:subject:subject:date:date:message-id:message-id:
	 to:to:cc:cc:mime-version:mime-version:content-type:content-type:
	 in-reply-to:in-reply-to:references:references;
	bh=XvtHqPooEuc/u7TjEr4XPu0LgsQ69YSnRmaEaxRUhws=;
	b=4zGtVov0LQYLDLxfPoU3VoETSJMCEQlPbBniPq2iErscr4pC44YBWsO9o9bjA4VRACCPyF
	SrOTrRFvg/cFOt7VmOa+pJ2nSGORtlNE3+gHtxs+xuS14M2FN8oEfWFUWIYa9v9Tv13uOg
	kyubTDRQu/gGq2Arlm1hPGf34TiR6jVbk7inuIeuFvlTlIAyPhtUdnzg3rD6uuwuArN6hF
	T9Z1DvOq5hb+s+9EsHOkIY211O2qGJOcrrmtyi2BZuL23D8r8PP3Pg6zJ64JE9ioTDqtZ6
	JSO4wH/TkvlnmG4hKVMfF/qKh86CcWb1vyi3wclhcvTbxbz6DEyyuBo/eLO78w==
DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de;
	s=2020e; t=1786702796;
	h=from:from:reply-to:subject:subject:date:date:message-id:message-id:
	 to:to:cc:cc:mime-version:mime-version:content-type:content-type:
	 in-reply-to:in-reply-to:references:references;
	bh=XvtHqPooEuc/u7TjEr4XPu0LgsQ69YSnRmaEaxRUhws=;
	b=19Bgy5OBnx6HmGT2MiHKetc7EBCR3TivFBCVAI7MTWGOa8FBFegr1mnBG2xcYt7BGV1IzN
	sLy8fR1eiIUuuDAw==
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Barry Song <baohua@kernel.org>, akpm@linux-foundation.org,
	hdanton@sina.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	minchan@kernel.org, ryncsn@gmail.com, yosry.ahmed@linux.dev,
	surenb@google.com, Dongdong Zhang <zhangdongdong5@xiaomi.com>,
	Suleiman Souhlal <suleiman@google.com>
Subject: Re: [RFC PATCH] zram: avoid preemption with CPU-based compression
 backends
Message-ID: <20260814101955.71AgFNAt@linutronix.de>
References: <20260805005545.66112-1-baohua@kernel.org>
 <anKQ_qZ1-Q6FchZ9@google.com>
 <CAGsJ_4wD+KNL0yMkuS4GijbHaiyPxgTmqKzkr0DErC0XH30w4A@mail.gmail.com>
 <anKaU6VStrW8zaQo@google.com>
 <CAGsJ_4wQ=mDXuxxTdAZkicN5pJK3SsNTOxHt5oNYrq7CgCVObw@mail.gmail.com>
 <anLGxk3iShEfCB30@google.com>
 <CAGsJ_4xU5VN3abCPzACZoS92MqaUrMHn9EQ1FCJD+wy=upbbMA@mail.gmail.com>
 <anMPLgbrf7XMC7Qw@google.com>
Precedence: bulk
X-Mailing-List: linux-kernel@vger.kernel.org
List-Id: <linux-kernel.vger.kernel.org>
List-Subscribe: <mailto:linux-kernel+subscribe@vger.kernel.org>
List-Unsubscribe: <mailto:linux-kernel+unsubscribe@vger.kernel.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
In-Reply-To: <anMPLgbrf7XMC7Qw@google.com>

On 2026-08-05 19:25:23 [+0900], Sergey Senozhatsky wrote:
> Hi Barry,
> 
> On (26/08/05 15:50), Barry Song wrote:
> > BTW, I wonder if compression and decompression could use separate
> > mutexes. That way, a sleepable zs_malloc() in the compression path
> > would not block decompression, which is the more latency-sensitive
> > operation.
> 
> quick and dirty patch.  Just curious if this improves anything on your
> side.
> 
> We also maybe can have more that num_online_cpus() stream, if we
> switch to idle streams list instead [1]
> 
> [1] https://lore.kernel.org/lkml/20250130111105.2861324-3-senozhatsky@chromium.org/

After reading this thread, I got to say that this looks quite nice
compared to the other two ;)

Sebastian