From: David Laight <david.laight.linux@gmail.com>
To: "Zach O'Keefe" <zokeefe@google.com>
Cc: Dave Hansen <dave.hansen@intel.com>,
"H. Peter Anvin" <hpa@zytor.com>,
David Stevens <stevensd@google.com>,
Pasha Tatashin <pasha.tatashin@soleen.com>,
Linus Walleij <linus.walleij@linaro.org>,
Will Deacon <willdeacon@google.com>,
Quentin Perret <qperret@google.com>,
Thomas Gleixner <tglx@kernel.org>, Ingo Molnar <mingo@redhat.com>,
Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, Andy Lutomirski <luto@kernel.org>,
Xin Li <xin@zytor.com>, Peter Zijlstra <peterz@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
David Hildenbrand <david@kernel.org>,
Lorenzo Stoakes <ljs@kernel.org>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
Vlastimil Babka <vbabka@kernel.org>,
Mike Rapoport <rppt@kernel.org>,
Suren Baghdasaryan <surenb@google.com>,
Michal Hocko <mhocko@suse.com>,
Uladzislau Rezki <urezki@gmail.com>, Kees Cook <kees@kernel.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH v2 00/13] Dynamic Kernel Stacks
Date: Fri, 26 Jun 2026 09:16:37 +0100 [thread overview]
Message-ID: <20260626091637.484ee07d@pumpkin> (raw)
In-Reply-To: <CAAa6QmRw6QLnVJ8+uvMV8ASreLXzSab5Jii3Ju11qCZYio6Few@mail.gmail.com>
On Thu, 18 Jun 2026 07:50:26 -0700
"Zach O'Keefe" <zokeefe@google.com> wrote:
...
> Dave,
>
> Necroing this thread, as the potential aggregate savings continue to
> stand out for us on the datacenter side (whereas David is motivated
> separately, from the consumer device side).
What are the other kernel memory costs associated with each thread?
While thinks like ps used to assume it was just 4k, it won't be any more.
Even for user threads many things that used to be per-process aren't
any more either.
But just the task structure and FP save area are non-trivial.
David L
next prev parent reply other threads:[~2026-06-26 8:16 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-24 19:14 [PATCH v2 00/13] Dynamic Kernel Stacks David Stevens
2026-04-24 19:14 ` [PATCH v2 01/13] fork: Remove assumption that vm_area->nr_pages equals to THREAD_SIZE David Stevens
2026-04-24 19:14 ` [PATCH v2 02/13] fork: Don't assume fully populated stack during reuse David Stevens
2026-04-24 19:14 ` [PATCH v2 03/13] fork: Move vm_stack to the beginning of the stack David Stevens
2026-04-24 19:14 ` [PATCH v2 04/13] fork: separate vmap stack allocation and free calls David Stevens
2026-04-24 19:14 ` [PATCH v2 05/13] mm/vmalloc: Add a get_vm_area_node() and vmap_pages_range() public functions David Stevens
2026-04-24 19:14 ` [PATCH v2 06/13] fork: Move vmap stack freeing to work queue David Stevens
2026-04-24 19:14 ` [PATCH v2 07/13] fork: Dynamic Kernel Stacks David Stevens
2026-04-24 19:14 ` [PATCH v2 08/13] task_stack.h: Add stack_not_used() support for dynamic stack David Stevens
2026-04-24 19:14 ` [PATCH v2 09/13] fork: Dynamic Kernel Stack accounting David Stevens
2026-04-24 19:14 ` [PATCH v2 10/13] fork: Store task pointer in unpopulated stack ptes David Stevens
2026-04-24 19:14 ` [PATCH v2 11/13] x86/entry/fred: encode frame pointer on entry David Stevens
2026-04-24 19:14 ` [PATCH v2 12/13] x86: Add support for dynamic kernel stacks via FRED David Stevens
2026-04-24 19:14 ` [PATCH v2 13/13] x86: Add support for dynamic kernel stacks via IST David Stevens
2026-04-24 19:41 ` [PATCH v2 00/13] Dynamic Kernel Stacks Dave Hansen
2026-04-24 21:35 ` Pasha Tatashin
2026-04-24 22:21 ` Dave Hansen
2026-04-24 22:49 ` David Stevens
2026-04-24 22:26 ` David Laight
2026-04-24 23:06 ` Pasha Tatashin
2026-06-19 0:29 ` Dave Hansen
2026-06-19 19:56 ` Zach O'Keefe
2026-06-20 5:25 ` David Stevens
2026-06-20 23:22 ` Dave Hansen
2026-04-25 9:19 ` H. Peter Anvin
2026-04-27 16:17 ` Dave Hansen
2026-06-18 14:50 ` Zach O'Keefe
2026-06-18 18:53 ` Dave Hansen
2026-06-18 22:28 ` H. Peter Anvin
2026-06-19 0:40 ` David Stevens
2026-06-19 0:44 ` H. Peter Anvin
2026-06-19 12:45 ` Thomas Gleixner
2026-06-19 19:20 ` Zach O'Keefe
2026-06-19 21:59 ` Thomas Gleixner
2026-06-20 5:02 ` David Stevens
2026-06-20 21:59 ` Thomas Gleixner
2026-06-20 19:33 ` Zach O'Keefe
2026-06-20 19:44 ` H. Peter Anvin
2026-06-20 20:01 ` Zach O'Keefe
2026-06-20 23:34 ` Thomas Gleixner
2026-06-22 23:00 ` Zach O'Keefe
2026-06-23 7:50 ` David Hildenbrand (Arm)
2026-06-23 9:10 ` David Laight
2026-06-23 9:19 ` David Hildenbrand (Arm)
2026-06-23 21:58 ` Thomas Gleixner
2026-06-25 11:56 ` Andrew Cooper
2026-06-25 21:38 ` H. Peter Anvin
2026-06-26 8:16 ` David Laight [this message]
2026-04-27 16:31 ` Pasha Tatashin
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