mirror of
https://github.com/xen-project/xen.git
synced 2026-10-29 02:30:03 +01:00
Keir Fraser
5cc436c1d2
This patch eliminate the global variables in libxenctrl (used for logging and error reporting). Instead the information which was in the global variables is now in a new xc_interface* opaque structure, which xc_interface open returns instead of the raw file descriptor; furthermore, logging is done via xentoollog. There are three new parameters to xc_interface_open to control the logging, but existing callers can just pass "0" for all three to get the old behaviour. All libxc callers have been adjusted accordingly. Also update QEMU_TAG for corresponding qemu change. Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
105 lines
2.4 KiB
C
105 lines
2.4 KiB
C
/******************************************************************************
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* tools/xenpaging/policy.c
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*
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* Xen domain paging default policy.
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*
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* Copyright (c) 2009 Citrix Systems, Inc. (Patrick Colp)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "bitops.h"
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#include "xc.h"
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#include "policy.h"
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#define MRU_SIZE 1024
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static unsigned long mru[MRU_SIZE];
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static unsigned int i_mru = 0;
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static unsigned long *bitmap;
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int policy_init(xenpaging_t *paging)
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{
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int i;
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int rc;
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/* Allocate bitmap for pages not to page out */
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rc = alloc_bitmap(&bitmap, paging->bitmap_size);
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if ( rc != 0 )
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goto out;
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/* Initialise MRU list of paged in pages */
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for ( i = 0; i < MRU_SIZE; i++ )
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mru[i] = INVALID_MFN;
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/* Don't page out page 0 */
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set_bit(0, bitmap);
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rc = 0;
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out:
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return rc;
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}
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int policy_choose_victim(xc_interface *xch,
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xenpaging_t *paging, domid_t domain_id,
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xenpaging_victim_t *victim)
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{
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ASSERT(victim != NULL);
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/* Domain to pick on */
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victim->domain_id = domain_id;
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do
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{
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/* Randomly choose a gfn to evict */
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victim->gfn = rand() % paging->domain_info->max_pages;
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}
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while ( test_bit(victim->gfn, bitmap) );
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return 0;
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}
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void policy_notify_paged_out(domid_t domain_id, unsigned long gfn)
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{
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set_bit(gfn, bitmap);
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}
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void policy_notify_paged_in(domid_t domain_id, unsigned long gfn)
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{
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unsigned long old_gfn = mru[i_mru & (MRU_SIZE - 1)];
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if ( old_gfn != INVALID_MFN )
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clear_bit(old_gfn, bitmap);
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mru[i_mru & (MRU_SIZE - 1)] = gfn;
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i_mru++;
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}
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/*
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* Local variables:
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* mode: C
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* c-set-style: "BSD"
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* c-basic-offset: 4
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* tab-width: 4
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* indent-tabs-mode: nil
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* End:
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*/
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