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From: Song Liu <song@kernel.org>
To: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Mike Rapoport <rppt@kernel.org>,
	linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Rick Edgecombe <rick.p.edgecombe@intel.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Vlastimil Babka <vbabka@suse.cz>,
	linux-kernel@vger.kernel.org, x86@kernel.org
Subject: Re: [RFC PATCH 1/5] mm: intorduce __GFP_UNMAPPED and unmapped_alloc()
Date: Fri, 19 May 2023 08:08:54 -0700	[thread overview]
Message-ID: <CAPhsuW7_hb9T-uuB2FuXYMs7WA_XMbV809zOPSV7eOQeh4k3Qw@mail.gmail.com> (raw)
In-Reply-To: <ZGbPz109t9Huxrqy@moria.home.lan>

On Thu, May 18, 2023 at 6:24 PM Kent Overstreet
<kent.overstreet@linux.dev> wrote:
>
> On Thu, May 18, 2023 at 01:51:08PM -0700, Song Liu wrote:
>
> > To allocate memory for text, we will allocate 2MiB, make it ROX, and then
> > use it for many small allocations. IIUC, buddy allocator will use unallocated
> > parts of this page for metadata. I guess this may be a problem, as the
> > whole page is ROX now, and we have to use text_poke to write to it.
>
> The standard kernel buddy allocator does _not_ store anything in the
> page itself - because the page might be a highmem page.

Thanks for the correction.
Song
>
> That's also why I went with the bitmap for my slab allocator; standard
> kernel slab allocator stores a freelist ptr in free objects.

  reply	other threads:[~2023-05-19 15:09 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-03-08  9:41 [RFC PATCH 0/5] Prototype for direct map awareness in page allocator Mike Rapoport
2023-03-08  9:41 ` [RFC PATCH 1/5] mm: intorduce __GFP_UNMAPPED and unmapped_alloc() Mike Rapoport
2023-03-09  1:56   ` Edgecombe, Rick P
2023-03-09 14:39     ` Mike Rapoport
2023-03-09 15:34       ` Edgecombe, Rick P
2023-03-09  6:31   ` Hyeonggon Yoo
2023-03-09 15:27     ` Mike Rapoport
2023-03-24  8:37   ` Michal Hocko
2023-03-25  6:38     ` Mike Rapoport
2023-03-27 13:43       ` Michal Hocko
2023-03-27 14:31         ` Vlastimil Babka
2023-03-27 15:10           ` Michal Hocko
2023-03-28  6:25         ` Mike Rapoport
2023-03-28  7:39           ` Michal Hocko
2023-03-28 15:11             ` Mike Rapoport
2023-03-28 15:24               ` Michal Hocko
2023-03-29  7:28                 ` Mike Rapoport
2023-03-29  8:13                   ` Michal Hocko
2023-03-30  5:13                     ` Mike Rapoport
2023-03-30  8:11                       ` Michal Hocko
2023-03-28 17:18               ` Luis Chamberlain
2023-03-28 17:37                 ` Matthew Wilcox
2023-03-28 17:52                   ` Luis Chamberlain
2023-03-28 17:55                     ` Luis Chamberlain
2023-05-18  3:35   ` Kent Overstreet
2023-05-18 15:23     ` Mike Rapoport
2023-05-18 16:33       ` Song Liu
2023-05-18 16:48         ` Kent Overstreet
2023-05-18 17:00           ` Song Liu
2023-05-18 17:23             ` Kent Overstreet
2023-05-18 18:47               ` Song Liu
2023-05-18 19:03                 ` Song Liu
2023-05-18 19:15                   ` Kent Overstreet
2023-05-18 20:03                     ` Song Liu
2023-05-18 20:13                       ` Kent Overstreet
2023-05-18 20:51                     ` Song Liu
2023-05-19  1:24                       ` Kent Overstreet
2023-05-19 15:08                         ` Song Liu [this message]
2023-05-18 19:16                   ` Kent Overstreet
2023-05-19  8:29               ` Mike Rapoport
2023-05-19 15:42                 ` Song Liu
2023-05-22 22:05                   ` Thomas Gleixner
2023-05-19 15:47                 ` Kent Overstreet
2023-05-19 16:14                   ` Mike Rapoport
2023-05-19 16:21                     ` Kent Overstreet
2023-05-18 16:58         ` Kent Overstreet
2023-05-18 17:15           ` Song Liu
2023-05-18 17:25             ` Kent Overstreet
2023-05-18 18:54               ` Song Liu
2023-05-18 19:01           ` Song Liu
2023-05-18 19:10             ` Kent Overstreet
2023-03-08  9:41 ` [RFC PATCH 2/5] mm/unmapped_alloc: add debugfs file similar to /proc/pagetypeinfo Mike Rapoport
2023-03-08  9:41 ` [RFC PATCH 3/5] mm/unmapped_alloc: add shrinker Mike Rapoport
2023-03-08  9:41 ` [RFC PATCH 4/5] EXPERIMENTAL: x86: use __GFP_UNMAPPED for modele_alloc() Mike Rapoport
2023-03-09  1:54   ` Edgecombe, Rick P
2023-03-08  9:41 ` [RFC PATCH 5/5] EXPERIMENTAL: mm/secretmem: use __GFP_UNMAPPED Mike Rapoport
2023-03-09  1:59 ` [RFC PATCH 0/5] Prototype for direct map awareness in page allocator Edgecombe, Rick P
2023-03-09 15:14   ` Mike Rapoport
2023-05-19 15:40     ` Sean Christopherson
2023-05-19 16:24       ` Mike Rapoport
2023-05-19 18:25         ` Sean Christopherson
2023-05-25 20:37           ` Mike Rapoport
2023-03-10  7:27 ` Christoph Hellwig
2023-03-27 14:27 ` Mike Rapoport

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