From: Uladzislau Rezki <urezki@gmail.com>
To: Michal Hocko <mhocko@suse.com>
Cc: NeilBrown <neilb@suse.de>,
Linux Memory Management List <linux-mm@kvack.org>,
Dave Chinner <david@fromorbit.com>,
Andrew Morton <akpm@linux-foundation.org>,
Christoph Hellwig <hch@infradead.org>,
linux-fsdevel@vger.kernel.org,
LKML <linux-kernel@vger.kernel.org>,
Ilya Dryomov <idryomov@gmail.com>,
Jeff Layton <jlayton@kernel.org>
Subject: Re: [RFC 2/3] mm/vmalloc: add support for __GFP_NOFAIL
Date: Mon, 25 Oct 2021 16:30:23 +0200 [thread overview]
Message-ID: <CA+KHdyWeQ77uWg5GxJGYiNeG_2ZuKu62-i=L7kqhw__g--XGYg@mail.gmail.com> (raw)
In-Reply-To: <YXaTBrhEqTZhTJYX@dhcp22.suse.cz>
>
> I would really prefer if this was not the main point of arguing here.
> Unless you feel strongly about msleep I would go with schedule_timeout
> here because this is a more widely used interface in the mm code and
> also because I feel like that relying on the rounding behavior is just
> subtle. Here is what I have staged now.
>
I have a preference but do not have a strong opinion here. You can go
either way you want.
>
> Are there any other concerns you see with this or other patches in the
> series?
>
it is better if you could send a new vX version because it is hard to
combine every "folded"
into one solid commit. One comment below:
> ---
> commit c1a7e40e6b56fed5b9e716de7055b77ea29d89d0
> Author: Michal Hocko <mhocko@suse.com>
> Date: Wed Oct 20 10:12:45 2021 +0200
>
> fold me "mm/vmalloc: add support for __GFP_NOFAIL"
>
> Add a short sleep before retrying. 1 jiffy is a completely random
> timeout. Ideally the retry would wait for an explicit event - e.g.
> a change to the vmalloc space change if the failure was caused by
> the space fragmentation or depletion. But there are multiple different
> reasons to retry and this could become much more complex. Keep the retry
> simple for now and just sleep to prevent from hogging CPUs.
>
> diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> index 0fb5413d9239..a866db0c9c31 100644
> --- a/mm/vmalloc.c
> +++ b/mm/vmalloc.c
> @@ -2944,6 +2944,7 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
> do {
> ret = vmap_pages_range(addr, addr + size, prot, area->pages,
> page_shift);
> + schedule_timeout_uninterruptible(1);
>
We do not want to schedule_timeout_uninterruptible(1); every time.
Only when an error is detected.
--
Uladzislau Rezki
next prev parent reply other threads:[~2021-10-25 14:30 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-18 11:47 [RFC 0/3] extend vmalloc support for constrained allocations Michal Hocko
2021-10-18 11:47 ` [RFC 1/3] mm/vmalloc: alloc GFP_NO{FS,IO} for vmalloc Michal Hocko
2021-10-19 0:44 ` NeilBrown
2021-10-19 6:59 ` Michal Hocko
2021-10-18 11:47 ` [RFC 2/3] mm/vmalloc: add support for __GFP_NOFAIL Michal Hocko
2021-10-18 16:48 ` Michal Hocko
2021-10-19 11:06 ` Uladzislau Rezki
2021-10-19 11:52 ` Michal Hocko
2021-10-19 19:46 ` Uladzislau Rezki
2021-10-20 8:25 ` Michal Hocko
2021-10-20 9:18 ` Michal Hocko
2021-10-20 13:54 ` Uladzislau Rezki
2021-10-20 14:06 ` Michal Hocko
2021-10-20 14:29 ` Uladzislau Rezki
2021-10-20 14:53 ` Michal Hocko
2021-10-20 15:00 ` Uladzislau Rezki
2021-10-20 19:24 ` Uladzislau Rezki
2021-10-21 8:56 ` Michal Hocko
2021-10-21 10:13 ` NeilBrown
2021-10-21 10:27 ` Michal Hocko
2021-10-21 10:40 ` Uladzislau Rezki
2021-10-21 22:49 ` NeilBrown
2021-10-22 8:18 ` Michal Hocko
2021-10-25 9:48 ` Uladzislau Rezki
2021-10-25 11:20 ` Michal Hocko
2021-10-25 14:30 ` Uladzislau Rezki [this message]
2021-10-25 14:56 ` Michal Hocko
2021-10-25 23:50 ` NeilBrown
2021-10-26 7:16 ` Michal Hocko
2021-10-26 10:24 ` NeilBrown
2021-10-26 14:25 ` Uladzislau Rezki
2021-10-26 14:43 ` Michal Hocko
2021-10-26 15:40 ` Uladzislau Rezki
2021-10-20 8:25 ` [PATCH] mm/vmalloc: be more explicit about supported gfp flags Michal Hocko
2021-10-18 11:47 ` [RFC 3/3] mm: allow !GFP_KERNEL allocations for kvmalloc Michal Hocko
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