Provide vfs.ncsizefactor instead of hard-coding namecache ratio.
Move debug.ncnegfactor to vfs.ncnegfactor [1]. Provide some descriptions for the namecache related sysctls [1]. Based on the submission by: Rogier R. Mulhuijzen <drwilco drwilco net> [1] MFC after: 2 weeks X-MFC-note: remove debug.ncnegfactor in HEAD after MFC
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=213916
@ -126,20 +126,27 @@ struct namecache {
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static LIST_HEAD(nchashhead, namecache) *nchashtbl; /* Hash Table */
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static TAILQ_HEAD(, namecache) ncneg; /* Hash Table */
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static u_long nchash; /* size of hash table */
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SYSCTL_ULONG(_debug, OID_AUTO, nchash, CTLFLAG_RD, &nchash, 0, "");
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SYSCTL_ULONG(_debug, OID_AUTO, nchash, CTLFLAG_RD, &nchash, 0,
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"Size of namecache hash table");
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static u_long ncnegfactor = 16; /* ratio of negative entries */
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/* _debug sysctl left for backward compatibility */
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SYSCTL_ULONG(_debug, OID_AUTO, ncnegfactor, CTLFLAG_RW, &ncnegfactor, 0, "");
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static u_long numneg; /* number of cache entries allocated */
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SYSCTL_ULONG(_debug, OID_AUTO, numneg, CTLFLAG_RD, &numneg, 0, "");
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SYSCTL_ULONG(_vfs, OID_AUTO, ncnegfactor, CTLFLAG_RW, &ncnegfactor, 0,
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"Ratio of negative namecache entries");
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static u_long numneg; /* number of negative entries allocated */
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SYSCTL_ULONG(_debug, OID_AUTO, numneg, CTLFLAG_RD, &numneg, 0,
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"Number of negative entries in namecache");
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static u_long numcache; /* number of cache entries allocated */
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SYSCTL_ULONG(_debug, OID_AUTO, numcache, CTLFLAG_RD, &numcache, 0, "");
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SYSCTL_ULONG(_debug, OID_AUTO, numcache, CTLFLAG_RD, &numcache, 0,
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"Number of namecache entries");
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static u_long numcachehv; /* number of cache entries with vnodes held */
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SYSCTL_ULONG(_debug, OID_AUTO, numcachehv, CTLFLAG_RD, &numcachehv, 0, "");
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#if 0
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static u_long numcachepl; /* number of cache purge for leaf entries */
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SYSCTL_ULONG(_debug, OID_AUTO, numcachepl, CTLFLAG_RD, &numcachepl, 0, "");
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#endif
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struct nchstats nchstats; /* cache effectiveness statistics */
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SYSCTL_ULONG(_debug, OID_AUTO, numcachehv, CTLFLAG_RD, &numcachehv, 0,
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"Number of namecache entries with vnodes held");
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static u_int ncsizefactor = 2;
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SYSCTL_UINT(_vfs, OID_AUTO, ncsizefactor, CTLFLAG_RW, &ncsizefactor, 0,
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"Size factor for namecache");
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struct nchstats nchstats; /* cache effectiveness statistics */
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static struct rwlock cache_lock;
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RW_SYSINIT(vfscache, &cache_lock, "Name Cache");
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@ -174,7 +181,8 @@ static uma_zone_t cache_zone_large;
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} while (0)
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static int doingcache = 1; /* 1 => enable the cache */
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SYSCTL_INT(_debug, OID_AUTO, vfscache, CTLFLAG_RW, &doingcache, 0, "");
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SYSCTL_INT(_debug, OID_AUTO, vfscache, CTLFLAG_RW, &doingcache, 0,
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"VFS namecache enabled");
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/* Export size information to userland */
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SYSCTL_INT(_debug_sizeof, OID_AUTO, namecache, CTLFLAG_RD, 0,
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@ -620,7 +628,7 @@ cache_enter(dvp, vp, cnp)
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/*
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* Avoid blowout in namecache entries.
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*/
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if (numcache >= desiredvnodes * 2)
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if (numcache >= desiredvnodes * ncsizefactor)
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return;
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flag = 0;
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