From: Michal Hocko <mhocko@suse.com>
To: David Hildenbrand <david@redhat.com>
Cc: Baoquan He <bhe@redhat.com>, Donald Dutile <ddutile@redhat.com>,
Jiri Bohac <jbohac@suse.cz>, Vivek Goyal <vgoyal@redhat.com>,
Dave Young <dyoung@redhat.com>,
kexec@lists.infradead.org, Philipp Rudo <prudo@redhat.com>,
Pingfan Liu <piliu@redhat.com>, Tao Liu <ltao@redhat.com>,
linux-kernel@vger.kernel.org,
David Hildenbrand <dhildenb@redhat.com>
Subject: Re: [PATCH v2 0/5] kdump: crashkernel reservation from CMA
Date: Thu, 29 May 2025 11:19:55 +0200 [thread overview]
Message-ID: <aDgmu2im03zrBZlt@tiehlicka> (raw)
In-Reply-To: <aDgQ0lbt1h5v0lgE@tiehlicka>
On Thu 29-05-25 09:46:28, Michal Hocko wrote:
> On Wed 28-05-25 23:01:04, David Hildenbrand wrote:
> [...]
> > I think we just have to be careful to document it properly -- especially the
> > shortcomings and that this feature might become a problem in the future.
> > Movable user-space page tables getting placed on CMA memory would probably
> > not be a problem if we don't care about ... user-space data either way.
>
> I think makedumpfile could refuse to capture a dump if userspace memory
> is requested to enforce this.
>
> > The whole "Direct I/O takes max 1s" part is a bit shaky. Maybe it could be
> > configurable how long to wait? 10s is certainly "safer".
>
> Quite honestly we will never know and rather than making this
> configurable I would go with reasonably large. Couple of seconds
> certainly do not matter for the kdump situations but I would go as far
typo
s@I would go@I would not go@
> as minutes.
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2025-05-29 9:29 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-20 16:48 [PATCH v2 0/5] kdump: crashkernel reservation from CMA Jiri Bohac
2025-02-20 16:51 ` [PATCH v2 1/5] Add a new optional ",cma" suffix to the crashkernel= command line option Jiri Bohac
2025-03-03 1:51 ` Baoquan He
2025-02-20 16:52 ` [PATCH v2 2/5] kdump: implement reserve_crashkernel_cma Jiri Bohac
2025-02-20 16:54 ` [PATCH v2 3/5] kdump, documentation: describe craskernel CMA reservation Jiri Bohac
2025-03-03 1:54 ` Baoquan He
2025-02-20 16:55 ` [PATCH v2 4/5] kdump: wait for DMA to finish when using CMA Jiri Bohac
2025-03-03 2:02 ` Baoquan He
2025-03-11 12:00 ` Jiri Bohac
2025-02-20 16:57 ` [PATCH v2 5/5] x86: implement crashkernel cma reservation Jiri Bohac
2025-03-03 2:08 ` [PATCH v2 0/5] kdump: crashkernel reservation from CMA Baoquan He
2025-03-03 8:25 ` David Hildenbrand
2025-03-03 14:17 ` Donald Dutile
2025-03-04 4:20 ` Baoquan He
2025-05-28 21:01 ` David Hildenbrand
2025-05-29 7:46 ` Michal Hocko
2025-05-29 9:19 ` Michal Hocko [this message]
2025-05-30 8:06 ` David Hildenbrand
2025-05-30 8:28 ` Michal Hocko
2025-05-30 8:39 ` David Hildenbrand
2025-05-30 9:07 ` Michal Hocko
2025-05-30 9:11 ` David Hildenbrand
2025-05-30 9:26 ` Michal Hocko
2025-05-30 9:28 ` David Hildenbrand
2025-05-30 9:34 ` Jiri Bohac
2025-05-30 9:47 ` David Hildenbrand
2025-05-30 9:54 ` Michal Hocko
2025-05-30 10:06 ` Jiri Bohac
2025-05-29 16:22 ` Jiri Bohac
2025-03-12 15:36 ` Jiri Bohac
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