linux-kernel - Re: [PATCH v3 3/3] mm/vmalloc: add more comments to the adjust_va_to_fit

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Message-ID: <20191018094115.GC8744@pc636>
Date:   Fri, 18 Oct 2019 11:41:15 +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 3/3] mm/vmalloc: add more comments to the
 adjust_va_to_fit_type()

On Wed, Oct 16, 2019 at 01:07:22PM +0200, Michal Hocko wrote:
> On Wed 16-10-19 11:54:38, Uladzislau Rezki (Sony) wrote:
> > When fit type is NE_FIT_TYPE there is a need in one extra object.
> > Usually the "ne_fit_preload_node" per-CPU variable has it and
> > there is no need in GFP_NOWAIT allocation, but there are exceptions.
> > 
> > This commit just adds more explanations, as a result giving
> > answers on questions like when it can occur, how often, under
> > which conditions and what happens if GFP_NOWAIT gets failed.
> > 
> > Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
> 
> Acked-by: Michal Hocko <mhocko@...e.com>
> 
Thanks!

--
Vlad Rezki