From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <SRS0=POAe=X5=kvack.org=owner-linux-mm@kernel.org>
X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on
	aws-us-west-2-korg-lkml-1.web.codeaurora.org
X-Spam-Level: 
X-Spam-Status: No, score=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS,
	MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no
	autolearn_force=no version=3.4.0
Received: from mail.kernel.org (mail.kernel.org [198.145.29.99])
	by smtp.lore.kernel.org (Postfix) with ESMTP id 82845C4360C
	for <linux-mm@archiver.kernel.org>; Fri,  4 Oct 2019 17:46:00 +0000 (UTC)
Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17])
	by mail.kernel.org (Postfix) with ESMTP id 5FD212133F
	for <linux-mm@archiver.kernel.org>; Fri,  4 Oct 2019 17:46:00 +0000 (UTC)
DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5FD212133F
Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linutronix.de
Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org
Received: by kanga.kvack.org (Postfix)
	id E40956B0005; Fri,  4 Oct 2019 13:45:59 -0400 (EDT)
Received: by kanga.kvack.org (Postfix, from userid 40)
	id DF0EC6B0006; Fri,  4 Oct 2019 13:45:59 -0400 (EDT)
X-Delivered-To: int-list-linux-mm@kvack.org
Received: by kanga.kvack.org (Postfix, from userid 63042)
	id D2EED6B0008; Fri,  4 Oct 2019 13:45:59 -0400 (EDT)
X-Delivered-To: linux-mm@kvack.org
Received: from forelay.hostedemail.com (smtprelay0160.hostedemail.com [216.40.44.160])
	by kanga.kvack.org (Postfix) with ESMTP id B34B56B0005
	for <linux-mm@kvack.org>; Fri,  4 Oct 2019 13:45:59 -0400 (EDT)
Received: from smtpin13.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251])
	by forelay03.hostedemail.com (Postfix) with SMTP id 6422E8243768
	for <linux-mm@kvack.org>; Fri,  4 Oct 2019 17:45:59 +0000 (UTC)
X-FDA: 76006830438.13.form63_17212657a661b
X-HE-Tag: form63_17212657a661b
X-Filterd-Recvd-Size: 1698
Received: from Galois.linutronix.de (Galois.linutronix.de [193.142.43.55])
	by imf20.hostedemail.com (Postfix) with ESMTP
	for <linux-mm@kvack.org>; Fri,  4 Oct 2019 17:45:58 +0000 (UTC)
Received: from bigeasy by Galois.linutronix.de with local (Exim 4.80)
	(envelope-from <bigeasy@linutronix.de>)
	id 1iGReL-0008Mj-QN; Fri, 04 Oct 2019 19:45:53 +0200
Date: Fri, 4 Oct 2019 19:45:53 +0200
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Uladzislau Rezki <urezki@gmail.com>
Cc: Daniel Wagner <dwagner@suse.de>, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org,
	Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH] mm: vmalloc: Use the vmap_area_lock to protect
 ne_fit_preload_node
Message-ID: <20191004174553.5fk2amnp4jblc7cy@linutronix.de>
References: <20191003090906.1261-1-dwagner@suse.de>
 <20191004153728.c5xppuqwqcwecbe6@linutronix.de>
 <20191004162041.GA30806@pc636>
 <20191004163042.jpiau6dlxqylbpfh@linutronix.de>
 <20191004170411.GA31114@pc636>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
In-Reply-To: <20191004170411.GA31114@pc636>
User-Agent: NeoMutt/20180716
X-Bogosity: Ham, tests=bogofilter, spamicity=0.000008, version=1.2.4
Sender: owner-linux-mm@kvack.org
Precedence: bulk
X-Loop: owner-majordomo@kvack.org
List-ID: <linux-mm.kvack.org>

On 2019-10-04 19:04:11 [+0200], Uladzislau Rezki wrote:
> if another, we can free the object allocated on previous step if
> it already has it. If another CPU does not have it, save it in 
> ne_fit_preload_node for another current CPU to reuse later. Further
> we can not migrate because of:
> 
> <snip>
>     spin_lock(&vmap_area_lock);
>     preempt_enable();
> <snip>

ah right. So you keep the lock later on, I somehow missed that part.
That way it actually makes sense.

Sebastian