From: Andi Kleen <ak@suse.de>
To: Ingo Molnar <mingo@elte.hu>
Cc: Andi Kleen <ak@suse.de>,
linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
Venki Pallipadi <venkatesh.pallipadi@intel.com>,
suresh.b.siddha@intel.com, Arjan van de Ven <arjan@infradead.org>,
Dave Jones <davej@redhat.com>
Subject: Re: CPA patchset
Date: Thu, 10 Jan 2008 11:07:12 +0100 [thread overview]
Message-ID: <20080110100712.GO25945@bingen.suse.de> (raw)
In-Reply-To: <20080110100443.GB28209@elte.hu>
On Thu, Jan 10, 2008 at 11:04:43AM +0100, Ingo Molnar wrote:
>
> * Andi Kleen <ak@suse.de> wrote:
>
> > > WBINVD isnt particular fast (takes a few msecs), but why is that a
> > > problem? Drivers dont do high-frequency ioremap-ing. It's
> > > typically only done at driver/device startup and that's it.
> >
> > Actually graphics drivers can do higher frequency allocation of WC
> > memory (with PAT) support.
>
> but that's not too smart: why dont they use WB plus cflush instead?
Because they need to access it WC for performance.
> ioremap() will always be slow and we dont care about stupid uses of it.
Uninterruptible msec latencies are too slow even for slow path
initialization code imho.
-Andi
next prev parent reply other threads:[~2008-01-10 10:07 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-03 15:24 [PATCH CPA] [1/28] Shrink __PAGE_KERNEL/__PAGE_KERNEL_EXEC on non PAE kernels Andi Kleen
2008-01-03 15:24 ` [PATCH CPA] [2/28] CPA: Do a simple self test at boot Andi Kleen
2008-01-03 15:24 ` [PATCH CPA] [3/28] Add pte accessors for the global bit Andi Kleen
2008-01-03 15:24 ` [PATCH CPA] [4/28] Add pte_clrhuge on i386 Andi Kleen
2008-01-05 6:48 ` Jeremy Fitzhardinge
2008-01-03 15:24 ` [PATCH CPA] [5/28] Add pte_pgprot " Andi Kleen
2008-01-03 15:24 ` [PATCH CPA] [6/28] CPA: Undo white space changes Andi Kleen
2008-01-03 15:24 ` [PATCH CPA] [7/28] Extract page table dumping code from i386 fault handler into dump_pagetable() Andi Kleen
2008-01-03 15:24 ` [PATCH CPA] [8/28] CPA: Return the page table level in lookup_address() Andi Kleen
2008-01-03 15:24 ` [PATCH CPA] [9/28] CPA: Add simple self test at boot Andi Kleen
2008-01-03 15:24 ` [PATCH CPA] [10/28] CPA: Change kernel_map_pages to not use c_p_a() Andi Kleen
2008-01-03 15:24 ` [PATCH CPA] [11/28] CPA: Change 32bit back to init_mm semaphore locking Andi Kleen
2008-01-03 15:24 ` [PATCH CPA] [12/28] CPA: CLFLUSH support in change_page_attr() Andi Kleen
2008-01-03 15:24 ` [PATCH CPA] [13/28] CPA: Use macros to modify the PG_arch_1 page flags in change_page_attr Andi Kleen
2008-01-03 15:24 ` [PATCH CPA] [14/28] CPA: Use page granuality TLB flushing " Andi Kleen
2008-01-03 15:24 ` [PATCH CPA] [15/28] CPA: Don't flush the caches when the CPU supports self-snoop Andi Kleen
2008-01-03 15:24 ` [PATCH CPA] [16/28] CPA: Use wbinvd() macro instead of inline assembly in 64bit c_p_a() Andi Kleen
2008-01-03 15:24 ` [PATCH CPA] [17/28] CPA: Reorder TLB / cache flushes to follow Intel recommendation Andi Kleen
2008-01-03 15:24 ` [PATCH CPA] [18/28] CPA: Make change_page_attr() more robust against use of PAT bits Andi Kleen
2008-01-03 15:24 ` [PATCH CPA] [19/28] CPA: Limit cache flushing to pages that really change caching Andi Kleen
2008-01-03 15:24 ` [PATCH CPA] [20/28] CPA: Fix inaccurate comments in 64bit change_page_attr() Andi Kleen
2008-01-03 15:24 ` [PATCH CPA] [21/28] CPA: Dump pagetable when inconsistency is detected Andi Kleen
2008-01-03 15:24 ` [PATCH CPA] [22/28] CPA: Only queue actually unused page table pages for freeing Andi Kleen
2008-01-03 15:24 ` [PATCH CPA] [23/28] CPA: Remove unnecessary masking of address Andi Kleen
2008-01-03 15:24 ` [PATCH CPA] [24/28] CPA: Only unmap kernel init pages in text mapping when CONFIG_DEBUG_RODATA is set Andi Kleen
2008-01-03 15:24 ` [PATCH CPA] [25/28] CPA: Always do full TLB flush when splitting large pages Andi Kleen
2008-01-03 15:24 ` [PATCH CPA] [26/28] CPA: Fix reference counting when changing already changed pages Andi Kleen
2008-01-03 15:24 ` [PATCH CPA] [27/28] CPA: Change comments of external interfaces to kerneldoc format Andi Kleen
2008-01-03 15:24 ` [PATCH CPA] [28/28] Make kernel_text test match boot mapping initialization Andi Kleen
2008-01-10 9:31 ` CPA patchset Ingo Molnar
2008-01-10 9:44 ` Dave Airlie
2008-01-10 9:55 ` Andi Kleen
2008-01-10 10:20 ` Dave Airlie
2008-01-10 10:50 ` Andi Kleen
2008-01-10 10:02 ` Ingo Molnar
2008-01-10 9:53 ` Andi Kleen
2008-01-10 10:04 ` Ingo Molnar
2008-01-10 10:07 ` Andi Kleen [this message]
2008-01-10 10:57 ` Ingo Molnar
2008-01-10 11:12 ` Andi Kleen
2008-01-11 7:19 ` Ingo Molnar
2008-01-11 7:33 ` Ingo Molnar
2008-01-11 11:28 ` Andi Kleen
2008-01-11 11:26 ` Andi Kleen
2008-01-11 17:02 ` dean gaudet
2008-01-11 17:18 ` Arjan van de Ven
2008-01-11 17:56 ` dean gaudet
2008-01-10 10:43 ` Ingo Molnar
2008-01-10 11:07 ` Andi Kleen
2008-01-10 12:22 ` Ingo Molnar
2008-01-10 12:39 ` Andi Kleen
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=20080110100712.GO25945@bingen.suse.de \
--to=ak@suse.de \
--cc=arjan@infradead.org \
--cc=davej@redhat.com \
--cc=hpa@zytor.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=suresh.b.siddha@intel.com \
--cc=tglx@linutronix.de \
--cc=venkatesh.pallipadi@intel.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.