linux-kernel - Re: [RFC 2/3] mm/vmalloc: add support for __GFP

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Message-ID: <20211020192430.GA1861@pc638.lan>
Date:   Wed, 20 Oct 2021 21:24:30 +0200
From:   Uladzislau Rezki <urezki@...il.com>
To:     Michal Hocko <mhocko@...e.com>
Cc:     Michal Hocko <mhocko@...e.com>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Dave Chinner <david@...morbit.com>, Neil Brown <neilb@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Hellwig <hch@...radead.org>,
        linux-fsdevel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Ilya Dryomov <idryomov@...il.com>,
        Jeff Layton <jlayton@...nel.org>
Subject: Re: [RFC 2/3] mm/vmalloc: add support for __GFP_NOFAIL

On Wed, Oct 20, 2021 at 05:00:28PM +0200, Uladzislau Rezki wrote:
> >
> > On Wed 20-10-21 16:29:14, Uladzislau Rezki wrote:
> > > On Wed, Oct 20, 2021 at 4:06 PM Michal Hocko <mhocko@...e.com> wrote:
> > [...]
> > > > As I've said I am OK with either of the two. Do you or anybody have any
> > > > preference? Without any explicit event to wake up for neither of the two
> > > > is more than just an optimistic retry.
> > > >
> > > From power perspective it is better to have a delay, so i tend to say
> > > that delay is better.
> >
> > I am a terrible random number generator. Can you give me a number
> > please?
> >
> Well, we can start from one jiffy so it is one timer tick: schedule_timeout(1)
> 
A small nit, it is better to replace it by the simple msleep() call: msleep(jiffies_to_msecs(1));

--
Vlad Rezki