From: "H. Peter Anvin" <hpa@zytor.com>
To: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: mingo@kernel.org, torvalds@linux-foundation.org,
andreas.herrmann3@amd.com, bp@amd64.org, robert.richter@amd.com,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/6] x86, fpu: cleanups, introduce non-lazy FPU restore for xsave
Date: Fri, 24 Aug 2012 14:33:11 -0700 [thread overview]
Message-ID: <5037F317.7020606@zytor.com> (raw)
In-Reply-To: <1345842782-24175-1-git-send-email-suresh.b.siddha@intel.com>
I have applied this to tip:x86/fpu, but I have also asked Suresh to
prepare a followon patch to decouple eager save from the existence of
the XSAVE instruction. It seems pretty clear that eager save is a net
benefit in the presence of the XSAVEOPT, but it isn't as clear for only
having XSAVE, as far as I can tell. Either way it would seem to be a
policy decision that is somewhat separate from the exact instruction.
-hpa
next prev parent reply other threads:[~2012-08-24 21:33 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-24 21:12 [PATCH 0/6] x86, fpu: cleanups, introduce non-lazy FPU restore for xsave Suresh Siddha
2012-08-24 21:12 ` [PATCH 1/6] x86, fpu: drop_fpu() before restoring new state from sigframe Suresh Siddha
2012-08-24 22:13 ` [tip:x86/fpu] " tip-bot for Suresh Siddha
2012-09-19 0:01 ` tip-bot for Suresh Siddha
2012-08-24 21:12 ` [PATCH 2/6] x86, fpu: remove unnecessary user_fpu_end() in save_xstate_sig() Suresh Siddha
2012-08-24 22:14 ` [tip:x86/fpu] " tip-bot for Suresh Siddha
2012-08-26 11:30 ` [PATCH 2/6] " Borislav Petkov
2012-09-19 0:02 ` [tip:x86/fpu] " tip-bot for Suresh Siddha
2012-08-24 21:12 ` [PATCH 3/6] x86, kvm: use kernel_fpu_begin/end() in kvm_load/put_guest_fpu() Suresh Siddha
2012-08-24 22:15 ` [tip:x86/fpu] x86, kvm: use kernel_fpu_begin/end() in kvm_load/ put_guest_fpu() tip-bot for Suresh Siddha
2012-09-19 0:03 ` tip-bot for Suresh Siddha
2012-09-19 10:13 ` [PATCH 3/6] x86, kvm: use kernel_fpu_begin/end() in kvm_load/put_guest_fpu() Avi Kivity
2012-09-19 17:18 ` Suresh Siddha
2012-09-19 17:22 ` Avi Kivity
2012-09-19 17:25 ` Suresh Siddha
2012-09-20 9:31 ` Avi Kivity
2012-09-19 17:26 ` H. Peter Anvin
2012-09-20 9:36 ` Avi Kivity
2012-09-20 0:10 ` Suresh Siddha
2012-09-20 9:50 ` Avi Kivity
2012-09-20 18:01 ` Suresh Siddha
2012-09-22 0:19 ` [tip:x86/fpu] x86, kvm: fix kvm's usage of kernel_fpu_begin/end() tip-bot for Suresh Siddha
2012-08-24 21:13 ` [PATCH 4/6] x86, fpu: always use kernel_fpu_begin/end() for in-kernel FPU usage Suresh Siddha
2012-08-24 22:16 ` [tip:x86/fpu] " tip-bot for Suresh Siddha
2012-09-19 0:04 ` tip-bot for Suresh Siddha
2012-08-24 21:13 ` [PATCH 5/6] lguest, x86: handle guest TS bit for lazy/non-lazy fpu host models Suresh Siddha
2012-08-24 22:16 ` [tip:x86/fpu] lguest, x86: handle guest TS bit for lazy/ non-lazy " tip-bot for Suresh Siddha
2012-09-19 0:05 ` tip-bot for Suresh Siddha
2012-08-24 21:13 ` [PATCH 6/6] x86, fpu: use non-lazy fpu restore for processors supporting xsave Suresh Siddha
2012-08-24 22:17 ` [tip:x86/fpu] " tip-bot for Suresh Siddha
2012-08-24 21:33 ` H. Peter Anvin [this message]
2012-08-25 18:34 ` [PATCH 0/6] x86, fpu: cleanups, introduce non-lazy FPU restore for xsave Linus Torvalds
-- strict thread matches above, loose matches on Subject: below --
2012-09-10 18:11 [PATCH v2 0/5] eagerfpu patches for tip/x86/fpu Suresh Siddha
2012-09-10 18:11 ` [PATCH v2 1/5] x86, fpu: decouple non-lazy/eager fpu restore from xsave Suresh Siddha
2012-09-17 19:11 ` Pavel Machek
2012-09-19 0:07 ` [tip:x86/fpu] x86, fpu: decouple non-lazy/ eager " tip-bot for Suresh Siddha
2012-09-10 18:11 ` [PATCH v2 2/5] x86, fpu: enable eagerfpu by default for xsaveopt Suresh Siddha
2012-09-19 0:08 ` [tip:x86/fpu] " tip-bot for Suresh Siddha
2012-09-10 18:11 ` [PATCH v2 3/5] x86, fpu: move check_fpu() after alternative_instructions() Suresh Siddha
2012-09-19 0:06 ` [tip:x86/fpu] x86, fpu: use non-lazy fpu restore for processors supporting xsave tip-bot for Suresh Siddha
2012-09-10 18:11 ` [PATCH v2 4/5] x86, fpu: make eagerfpu= boot param tri-state Suresh Siddha
2012-09-19 0:09 ` [tip:x86/fpu] " tip-bot for Suresh Siddha
2012-09-10 18:11 ` [PATCH v2 5/5] x86, fpu: remove cpu_has_xmm check in the fx_finit() Suresh Siddha
2012-09-19 0:10 ` [tip:x86/fpu] " tip-bot for Suresh Siddha
2012-09-10 18:16 ` [PATCH v2 0/5] eagerfpu patches for tip/x86/fpu Borislav Petkov
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=5037F317.7020606@zytor.com \
--to=hpa@zytor.com \
--cc=andreas.herrmann3@amd.com \
--cc=bp@amd64.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@kernel.org \
--cc=robert.richter@amd.com \
--cc=suresh.b.siddha@intel.com \
--cc=torvalds@linux-foundation.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 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.