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a compromise for freelist scanning - we now will look for other than the first fit, but get exponentially more desperate as we get deeper into the freelist

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(This used to be ctdb commit f3319ef84c47dc8bf0bfb4ef1c72cee58ed9d88c)
This commit is contained in:
Andrew Tridgell 2008-01-09 15:33:10 +11:00
parent 5b6486c35b
commit bc85af6b61
1 changed files with 16 additions and 1 deletions
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17
ctdb/lib/tdb/common/freelist.c
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@ -280,6 +280,7 @@ tdb_off_t tdb_allocate(struct tdb_context *tdb, tdb_len_t length, struct list_st
tdb_off_t rec_ptr, last_ptr;
tdb_len_t rec_len;
} bestfit;
float multiplier = 1.0;
if (tdb_lock(tdb, -1, F_WRLCK) == -1)
return 0;
@ -314,13 +315,27 @@ tdb_off_t tdb_allocate(struct tdb_context *tdb, tdb_len_t length, struct list_st
bestfit.rec_len = rec->rec_len;
bestfit.rec_ptr = rec_ptr;
bestfit.last_ptr = last_ptr;
break;
}
}
/* move to the next record */
last_ptr = rec_ptr;
rec_ptr = rec->next;
/* if we've found a record that is big enough, then
stop searching if its also not too big. The
definition of 'too big' changes as we scan
through */
if (bestfit.rec_len > 0 &&
bestfit.rec_len < length * multiplier) {
break;
}
/* this multiplier means we only extremely rarely
search more than 50 or so records. At 50 records we
accept records up to 11 times larger than what we
want */
multiplier *= 1.05;
}
if (bestfit.rec_ptr != 0) {