linux-kernel - Re: [PATCH v3 2/3] mm/vmalloc: respect passed gfp

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Message-ID: <20191018094049.GB8744@pc636>
Date:   Fri, 18 Oct 2019 11:40:49 +0200
From:   Uladzislau Rezki <urezki@...il.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     "Uladzislau Rezki (Sony)" <urezki@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Daniel Wagner <dwagner@...e.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Thomas Gleixner <tglx@...utronix.de>, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Hillf Danton <hdanton@...a.com>,
        Matthew Wilcox <willy@...radead.org>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...ymobile.com>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH v3 2/3] mm/vmalloc: respect passed gfp_mask when do
 preloading

> > alloc_vmap_area() is given a gfp_mask for the page allocator.
> > Let's respect that mask and consider it even in the case when
> > doing regular CPU preloading, i.e. where a context can sleep.
> 
> This is explaining what but it doesn't say why. I would go with
> "
> Allocation functions should comply with the given gfp_mask as much as
> possible. The preallocation code in alloc_vmap_area doesn't follow that
> pattern and it is using a hardcoded GFP_KERNEL. Although this doesn't
> really make much difference because vmalloc is not GFP_NOWAIT compliant
> in general (e.g. page table allocations are GFP_KERNEL) there is no
> reason to spread that bad habit and it is good to fix the antipattern.
> "
I can go with that, agree. I am not sure if i need to update the patch
and send v4. Or maybe Andrew can directly update it in his tree.

Andrew, should i send or can update?

Thank you in advance!

--
Vlad Rezki