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https://github.com/xen-project/xen.git
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Andres Lagar-Cavilla
447e175bad
This patch is the folded version of API updates, along with the associated tool changes to ensure that the build is always consistent. API updates: - The source domain in the sharing calls is no longer assumed to be dom0. - Previously, the mem sharing code would return an opaque handle to index shared pages (and nominees) in its global hash table. By removing the hash table, the handle becomes a version, to avoid sharing a stale version of a page. Thus, libxc wrappers and tools need to be updated to recall the share functions with the information needed to fetch the page (which they readily have). Tool updates: The only (in-tree, that we know of) consumer of the mem sharing API is the memshr tool. This is updated to use the new API. Signed-off-by: Andres Lagar-Cavilla <andres@lagarcavilla.org> Signed-off-by: Adin Scannell <adin@scannell.ca> Acked-by: Ian Campbell <ian.campbell@citrix.com> Committed-by: Tim Deegan <tim@xen.org>
105 lines
3.2 KiB
C
105 lines
3.2 KiB
C
/******************************************************************************
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*
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* Copyright (c) 2009 Citrix Systems, Inc. (Grzegorz Milos)
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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 <pthread.h>
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#include <inttypes.h>
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#include <unistd.h>
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#include <errno.h>
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#include "bidir-hash.h"
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#include "memshr-priv.h"
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static struct blockshr_hash *blks_hash;
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/* Callback in the iterator, remember this value, and leave */
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int find_one(vbdblk_t k, share_tuple_t v, void *priv)
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{
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share_tuple_t *rv = (share_tuple_t *) priv;
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*rv = v;
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/* Break out of iterator loop */
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return 1;
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}
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void* bidir_daemon(void *unused)
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{
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uint32_t nr_ent, max_nr_ent, tab_size, max_load, min_load;
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while(1)
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{
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blockshr_hash_sizes( blks_hash,
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&nr_ent,
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&max_nr_ent,
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&tab_size,
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&max_load,
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&min_load);
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/* Remove some hints as soon as we get to 90% capacity */
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if(10 * nr_ent > 9 * max_nr_ent)
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{
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share_tuple_t next_remove;
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int to_remove;
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int ret;
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to_remove = 0.1 * max_nr_ent;
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while(to_remove > 0)
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{
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/* We use the iterator to get one entry */
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next_remove.handle = 0;
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ret = blockshr_hash_iterator(blks_hash, find_one, &next_remove);
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if ( !ret )
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if ( next_remove.handle == 0 )
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ret = -ESRCH;
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if ( !ret )
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ret = blockshr_shrhnd_remove(blks_hash, next_remove, NULL);
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if(ret <= 0)
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{
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/* We failed to remove an entry, because of a serious hash
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* table error */
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DPRINTF("Could not remove handle %"PRId64", error: %d\n",
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next_remove.handle, ret);
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/* Force to exit the loop early */
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to_remove = 0;
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} else
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if(ret > 0)
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{
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/* Managed to remove the entry. Note next_remove not
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* incremented, in case there are duplicates */
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to_remove--;
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}
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}
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}
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sleep(1);
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}
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}
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void bidir_daemon_launch(void)
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{
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pthread_t thread;
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pthread_create(&thread, NULL, bidir_daemon, NULL);
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}
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void bidir_daemon_initialize(struct blockshr_hash *blks)
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{
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blks_hash = blks;
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bidir_daemon_launch();
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}
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