Revision e8a03feb54ca7f1768bbdc2b491f9ef654e6d01d authored by Rik van Riel on 14 April 2010, 21:59:28 UTC, committed by Linus Torvalds on 19 April 2010, 23:28:20 UTC
The recent anon_vma fixes cause many anonymous pages to end up in the parent process anon_vma, even when the page is exclusively owned by the current process. Adding exclusively owned anonymous pages to the top anon_vma reduces rmap scanning overhead, especially in workloads with forking servers. This patch adds a parameter to __page_set_anon_rmap that can be used to indicate whether or not the added page is exclusively owned by the current process. Pages added through page_add_new_anon_rmap are exclusively owned by the current process, and can be added to the top anon_vma. Pages added through page_add_anon_rmap can be either shared or exclusively owned, so we do the conservative thing and add it to the oldest anon_vma. A next step would be to add the exclusive parameter to page_add_anon_rmap, to be used from functions where we do know for sure whether a page is exclusively owned. Signed-off-by: Rik van Riel <riel@redhat.com> Reviewed-by: Johannes Weiner <hannes@cmpxchg.org> Lightly-tested-by: Borislav Petkov <bp@alien8.de> Reviewed-by: Minchan Kim <minchan.kim@gmail.com> [ Edited to look nicer - Linus ] Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 9b030e2
evtchn.h
/******************************************************************************
* evtchn.h
*
* Interface to /dev/xen/evtchn.
*
* Copyright (c) 2003-2005, K A Fraser
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation; or, when distributed
* separately from the Linux kernel or incorporated into other
* software packages, subject to the following license:
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this source file (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy, modify,
* merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#ifndef __LINUX_PUBLIC_EVTCHN_H__
#define __LINUX_PUBLIC_EVTCHN_H__
/*
* Bind a fresh port to VIRQ @virq.
* Return allocated port.
*/
#define IOCTL_EVTCHN_BIND_VIRQ \
_IOC(_IOC_NONE, 'E', 0, sizeof(struct ioctl_evtchn_bind_virq))
struct ioctl_evtchn_bind_virq {
unsigned int virq;
};
/*
* Bind a fresh port to remote <@remote_domain, @remote_port>.
* Return allocated port.
*/
#define IOCTL_EVTCHN_BIND_INTERDOMAIN \
_IOC(_IOC_NONE, 'E', 1, sizeof(struct ioctl_evtchn_bind_interdomain))
struct ioctl_evtchn_bind_interdomain {
unsigned int remote_domain, remote_port;
};
/*
* Allocate a fresh port for binding to @remote_domain.
* Return allocated port.
*/
#define IOCTL_EVTCHN_BIND_UNBOUND_PORT \
_IOC(_IOC_NONE, 'E', 2, sizeof(struct ioctl_evtchn_bind_unbound_port))
struct ioctl_evtchn_bind_unbound_port {
unsigned int remote_domain;
};
/*
* Unbind previously allocated @port.
*/
#define IOCTL_EVTCHN_UNBIND \
_IOC(_IOC_NONE, 'E', 3, sizeof(struct ioctl_evtchn_unbind))
struct ioctl_evtchn_unbind {
unsigned int port;
};
/*
* Unbind previously allocated @port.
*/
#define IOCTL_EVTCHN_NOTIFY \
_IOC(_IOC_NONE, 'E', 4, sizeof(struct ioctl_evtchn_notify))
struct ioctl_evtchn_notify {
unsigned int port;
};
/* Clear and reinitialise the event buffer. Clear error condition. */
#define IOCTL_EVTCHN_RESET \
_IOC(_IOC_NONE, 'E', 5, 0)
#endif /* __LINUX_PUBLIC_EVTCHN_H__ */
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