From: Avi Kivity <avi@qumranet.com>
To: kvm-devel@lists.sourceforge.net
Cc: linux-kernel@vger.kernel.org, Eddie Dong <eddie.dong@intel.com>,
Avi Kivity <avi@qumranet.com>
Subject: [PATCH 14/18] KVM: VMX: Avoid unnecessary vcpu_load()/vcpu_put() cycles
Date: Thu, 26 Apr 2007 12:22:14 +0300 [thread overview]
Message-ID: <1177579338397-git-send-email-avi@qumranet.com> (raw)
In-Reply-To: <11775793382353-git-send-email-avi@qumranet.com>
From: Eddie Dong <eddie.dong@intel.com>
By checking if a reschedule is needed, we avoid dropping the vcpu.
[With changes by me, based on Anthony Liguori's observations]
Signed-off-by: Avi Kivity <avi@qumranet.com>
---
drivers/kvm/kvm_main.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 03c0ee7..f535635 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -1590,6 +1590,8 @@ static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
void kvm_resched(struct kvm_vcpu *vcpu)
{
+ if (!need_resched())
+ return;
vcpu_put(vcpu);
cond_resched();
vcpu_load(vcpu);
--
1.5.0.6
next prev parent reply other threads:[~2007-04-26 9:24 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-26 9:22 [PATCH 00/18] KVM updates for 2.6.22 Avi Kivity
2007-04-26 9:22 ` [PATCH 01/18] KVM: Use kernel-standard types Avi Kivity
2007-04-26 9:22 ` [PATCH 02/18] KVM: Fix overflow bug in overflow detection code Avi Kivity
2007-04-26 9:22 ` [PATCH 03/18] KVM: Initialize cr0 to indicate an fpu is present Avi Kivity
2007-04-26 9:22 ` [PATCH 04/18] KVM: Handle partial pae pdptr Avi Kivity
2007-04-26 9:22 ` [PATCH 05/18] KVM: Use slab caches to allocate mmu data structures Avi Kivity
2007-04-26 9:22 ` [PATCH 06/18] KVM: Retry sleeping allocation if atomic allocation fails Avi Kivity
2007-04-26 9:22 ` [PATCH 07/18] KVM: SVM: Report hardware exit reason to userspace instead of dmesg Avi Kivity
2007-04-26 9:22 ` [PATCH 08/18] KVM: Handle guest page faults when emulating mmio Avi Kivity
2007-04-26 9:22 ` [PATCH 09/18] KVM: VMX: Reduce unnecessary saving of host msrs Avi Kivity
2007-04-26 9:22 ` [PATCH 10/18] KVM: VMX: Don't switch 64-bit msrs for 32-bit guests Avi Kivity
2007-04-26 9:22 ` [PATCH 11/18] KVM: Fold drivers/kvm/kvm_vmx.h into drivers/kvm/vmx.c Avi Kivity
2007-04-26 9:22 ` [PATCH 12/18] KVM: VMX: Only save/restore MSR_K6_STAR if necessary Avi Kivity
2007-04-26 9:22 ` [PATCH 13/18] KVM: MMU: Avoid heavy ASSERT at non debug mode Avi Kivity
2007-04-26 9:22 ` Avi Kivity [this message]
2007-04-26 9:22 ` [PATCH 15/18] KVM: Per-vcpu statistics Avi Kivity
2007-04-26 9:22 ` [PATCH 16/18] KVM: Allow passing 64-bit values to the emulated read/write API Avi Kivity
2007-04-26 9:22 ` [PATCH 17/18] KVM: Lazy FPU support for SVM Avi Kivity
2007-04-26 9:22 ` [PATCH 18/18] KVM: Don't complain about cpu erratum AA15 Avi Kivity
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=1177579338397-git-send-email-avi@qumranet.com \
--to=avi@qumranet.com \
--cc=eddie.dong@intel.com \
--cc=kvm-devel@lists.sourceforge.net \
--cc=linux-kernel@vger.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