From: Michal Hocko <mhocko@suse.com>
To: NeilBrown <neilb@suse.de>
Cc: Uladzislau Rezki <urezki@gmail.com>,
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: Fri, 22 Oct 2021 10:18:41 +0200 [thread overview]
Message-ID: <YXJz4QVsNk4kUZvH@dhcp22.suse.cz> (raw)
In-Reply-To: <163485654850.17149.3604437537345538737@noble.neil.brown.name>
On Fri 22-10-21 09:49:08, Neil Brown wrote:
[...]
> However now that I've thought about some more, I'd much prefer we
> introduce something like
> memalloc_retry_wait();
>
> and use that everywhere that a memory allocation is retried.
> I'm not convinced that we need to wait at all - at least, not when
> __GFP_DIRECT_RECLAIM is used, as in that case alloc_page will either
> - succeed
> - make some progress a reclaiming or
> - sleep
There
are two that we have to do explicitly vmap_pages_range one is due to
implicit GFP_KERNEL allocations for page tables. Those would likely be a
good fit for something you suggest above. Then we have __get_vm_area_node
retry loop which can be either due to vmalloc space reservation failure
or an implicit GFP_KERNEL allocation by kasan. The first one is not
really related to the memory availability so it doesn't sound like a
good fit.
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2021-10-22 8:18 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 [this message]
2021-10-25 9:48 ` Uladzislau Rezki
2021-10-25 11:20 ` Michal Hocko
2021-10-25 14:30 ` Uladzislau Rezki
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=YXJz4QVsNk4kUZvH@dhcp22.suse.cz \
--to=mhocko@suse.com \
--cc=akpm@linux-foundation.org \
--cc=david@fromorbit.com \
--cc=hch@infradead.org \
--cc=idryomov@gmail.com \
--cc=jlayton@kernel.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=neilb@suse.de \
--cc=urezki@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).