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84 lines
1.9 KiB
C
84 lines
1.9 KiB
C
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1996-2002
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* Sleepycat Software. All rights reserved.
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*/
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#include "db_config.h"
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#ifndef lint
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static const char revid[] = "$Id: mp_trickle.c,v 11.24 2002/08/06 06:13:53 bostic Exp $";
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#endif /* not lint */
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#ifndef NO_SYSTEM_INCLUDES
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#include <sys/types.h>
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#include <stdlib.h>
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#endif
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#include "db_int.h"
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#include "dbinc/db_shash.h"
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#include "dbinc/mp.h"
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/*
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* __memp_trickle --
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* Keep a specified percentage of the buffers clean.
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*
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* PUBLIC: int __memp_trickle __P((DB_ENV *, int, int *));
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*/
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int
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__memp_trickle(dbenv, pct, nwrotep)
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DB_ENV *dbenv;
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int pct, *nwrotep;
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{
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DB_MPOOL *dbmp;
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MPOOL *c_mp, *mp;
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u_int32_t clean, dirty, i, total, dtmp;
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int ret, wrote;
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PANIC_CHECK(dbenv);
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ENV_REQUIRES_CONFIG(dbenv,
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dbenv->mp_handle, "memp_trickle", DB_INIT_MPOOL);
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dbmp = dbenv->mp_handle;
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mp = dbmp->reginfo[0].primary;
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if (nwrotep != NULL)
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*nwrotep = 0;
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if (pct < 1 || pct > 100)
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return (EINVAL);
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/*
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* If there are sufficient clean buffers, no buffers or no dirty
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* buffers, we're done.
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*
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* XXX
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* Using hash_page_dirty is our only choice at the moment, but it's not
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* as correct as we might like in the presence of pools having more
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* than one page size, as a free 512B buffer isn't the same as a free
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* 8KB buffer.
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*
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* Loop through the caches counting total/dirty buffers.
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*/
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for (ret = 0, i = dirty = total = 0; i < mp->nreg; ++i) {
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c_mp = dbmp->reginfo[i].primary;
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total += c_mp->stat.st_pages;
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__memp_stat_hash(&dbmp->reginfo[i], c_mp, &dtmp);
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dirty += dtmp;
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}
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clean = total - dirty;
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if (clean == total || (clean * 100) / total >= (u_long)pct)
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return (0);
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if (nwrotep == NULL)
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nwrotep = &wrote;
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ret = __memp_sync_int(dbenv, NULL,
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((total * pct) / 100) - clean, DB_SYNC_TRICKLE, nwrotep);
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mp->stat.st_page_trickle += *nwrotep;
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return (ret);
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}
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