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https://github.com/torvalds/linux
23 October 2021, 00:29:24 UTC
Revision bccf2150fe62dda5fb09efa2f64d2a234694eb48 authored by Avi Kivity on 21 February 2007, 16:04:26 UTC, committed by Avi Kivity on 04 March 2007, 09:12:42 UTC 
KVM: Per-vcpu inodes
 
Allocate a distinct inode for every vcpu in a VM.  This has the following
benefits:

 - the filp cachelines are no longer bounced when f_count is incremented on
   every ioctl()
 - the API and internal code are distinctly clearer; for example, on the
   KVM_GET_REGS ioctl, there is no need to copy the vcpu number from
   userspace and then copy the registers back; the vcpu identity is derived
   from the fd used to make the call

Right now the performance benefits are completely theoretical since (a) we
don't support more than one vcpu per VM and (b) virtualization hardware
inefficiencies completely everwhelm any cacheline bouncing effects.  But
both of these will change, and we need to prepare the API today.

Signed-off-by: Avi Kivity <avi@qumranet.com>
1 parent c5ea766
History
Tip revision: bccf2150fe62dda5fb09efa2f64d2a234694eb48 authored by Avi Kivity on 21 February 2007, 16:04:26 UTC
KVM: Per-vcpu inodes
Tip revision: bccf215
File Mode Size
Documentation
arch
block
crypto
drivers
fs
include
init
ipc
kernel
lib
mm
net
scripts
security
sound
usr
.gitignore -rw-r--r-- 572 bytes
.mailmap -rw-r--r-- 3.5 KB
COPYING -rw-r--r-- 18.3 KB
CREDITS -rw-r--r-- 88.9 KB
Kbuild -rw-r--r-- 1.2 KB
MAINTAINERS -rw-r--r-- 82.1 KB
Makefile -rw-r--r-- 49.1 KB
README -rw-r--r-- 16.5 KB
REPORTING-BUGS -rw-r--r-- 3.0 KB

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