From: Peter Zijlstra <peterz@infradead.org>
To: Joerg Roedel <joro@8bytes.org>
Cc: x86@kernel.org, hpa@zytor.com,
Dave Hansen <dave.hansen@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>,
rjw@rjwysocki.net, Arnd Bergmann <arnd@arndb.de>,
Andrew Morton <akpm@linux-foundation.org>,
Steven Rostedt <rostedt@goodmis.org>,
Vlastimil Babka <vbabka@suse.cz>,
Michal Hocko <mhocko@kernel.org>, Joerg Roedel <jroedel@suse.de>,
linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
linux-arch@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [RFC PATCH 2/7] mm/vmalloc: Track which page-table levels were modified
Date: Fri, 8 May 2020 21:10:48 +0200 [thread overview]
Message-ID: <20200508191048.GA2957@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20200508144043.13893-3-joro@8bytes.org>
On Fri, May 08, 2020 at 04:40:38PM +0200, Joerg Roedel wrote:
> +/*
> + * Architectures can set this mask to a combination of PGTBL_P?D_MODIFIED values
> + * and let generic vmalloc and ioremap code know when arch_sync_kernel_mappings()
> + * needs to be called.
> + */
> +#ifndef ARCH_PAGE_TABLE_SYNC_MASK
> +#define ARCH_PAGE_TABLE_SYNC_MASK 0
> +#endif
> +
> +void arch_sync_kernel_mappings(unsigned long start, unsigned long end);
> + if (mask & ARCH_PAGE_TABLE_SYNC_MASK)
> + arch_sync_kernel_mappings(start, end);
So you're relying on the compiler DCE'ing the call in the 'normal' case.
Works I suppose, but I went over the patches twice to look for a default
implementation of it before I figured that out ...
next prev parent reply other threads:[~2020-05-08 19:11 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-08 14:40 [RFC PATCH 0/7] mm: Get rid of vmalloc_sync_(un)mappings() Joerg Roedel
2020-05-08 14:40 ` [RFC PATCH 1/7] mm: Add functions to track page directory modifications Joerg Roedel
2020-05-08 14:40 ` [RFC PATCH 2/7] mm/vmalloc: Track which page-table levels were modified Joerg Roedel
2020-05-08 19:10 ` Peter Zijlstra [this message]
2020-05-08 21:23 ` Joerg Roedel
2020-05-08 14:40 ` [RFC PATCH 3/7] mm/ioremap: " Joerg Roedel
2020-05-08 14:40 ` [RFC PATCH 4/7] x86/mm/64: Implement arch_sync_kernel_mappings() Joerg Roedel
2020-05-08 14:40 ` [RFC PATCH 5/7] x86/mm/32: " Joerg Roedel
2020-05-08 14:40 ` [RFC PATCH 6/7] mm: Remove vmalloc_sync_(un)mappings() Joerg Roedel
2020-05-08 18:58 ` Steven Rostedt
2020-05-08 21:24 ` Joerg Roedel
2020-05-08 14:40 ` [RFC PATCH 7/7] x86/mm: Remove vmalloc faulting Joerg Roedel
2020-05-08 19:20 ` [RFC PATCH 0/7] mm: Get rid of vmalloc_sync_(un)mappings() Peter Zijlstra
2020-05-08 21:34 ` Joerg Roedel
2020-05-09 9:25 ` Peter Zijlstra
2020-05-09 17:54 ` Joerg Roedel
2020-05-10 1:11 ` Matthew Wilcox
2020-05-11 7:31 ` Peter Zijlstra
2020-05-11 15:52 ` Matthew Wilcox
2020-05-11 16:08 ` Matthew Wilcox
2020-05-11 17:02 ` Peter Zijlstra
2020-05-08 21:33 ` Andy Lutomirski
2020-05-08 21:36 ` Joerg Roedel
2020-05-08 23:49 ` Andy Lutomirski
2020-05-09 17:52 ` Joerg Roedel
2020-05-09 19:05 ` Andy Lutomirski
2020-05-09 21:57 ` Joerg Roedel
2020-05-10 5:05 ` Andy Lutomirski
2020-05-10 8:15 ` Joerg Roedel
2020-05-11 7:42 ` Peter Zijlstra
2020-05-11 15:36 ` Andy Lutomirski
2020-05-11 17:06 ` Peter Zijlstra
2020-05-11 19:14 ` Joerg Roedel
2020-05-11 19:36 ` Andy Lutomirski
2020-05-12 15:02 ` Joerg Roedel
2020-05-12 15:13 ` Steven Rostedt
2020-05-11 20:50 ` Steven Rostedt
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=20200508191048.GA2957@hirez.programming.kicks-ass.net \
--to=peterz@infradead.org \
--cc=akpm@linux-foundation.org \
--cc=arnd@arndb.de \
--cc=dave.hansen@linux.intel.com \
--cc=hpa@zytor.com \
--cc=joro@8bytes.org \
--cc=jroedel@suse.de \
--cc=linux-acpi@vger.kernel.org \
--cc=linux-arch@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=luto@kernel.org \
--cc=mhocko@kernel.org \
--cc=rjw@rjwysocki.net \
--cc=rostedt@goodmis.org \
--cc=vbabka@suse.cz \
--cc=x86@kernel.org \
/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).