Re: [PATCHv2 0/2] blk-mq: Avoid memory reclaim when allocating request map

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On Mon, Sep 16, 2019 at 10:52:33AM -0600, Jens Axboe wrote:
> On 9/16/19 3:06 AM, Christoph Hellwig wrote:
> > On Mon, Sep 16, 2019 at 07:46:29AM +0530, xiubli@xxxxxxxxxx wrote:
> >> From: Xiubo Li <xiubli@xxxxxxxxxx>
> >>
> >> To make the patch more readable and cleaner I just split them into 2
> >> small ones to address the issue from @Ming Lei, thanks very much.
> > 
> > I'd be much happier to just see memalloc_noio_save +
> > memalloc_noio_restore calls in the right places over sprinkling even
> > more magic GFP_NOIO arguments.
> 
> Ugh, I always thought those were kind of lame and band aiding around
> places where people are too lazy to fix the path to the gfp args.
> Or maybe areas where it's just feasible.

The way I understood the discussion around the introduction of these
flags is that we want to phase out GFP_NOIO and GFP_NOFS in the long
run, given that ammending all calls is basically impossibly, while
marking contexts is pretty easy.



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