windows-cell-hashtables-20070622

Add name and ID hash tables for cell lookups.  cell lookups occur on
every request.  sometimes multiple times.  removing the walking of the
cell list when there are dozens of cells decreases cpu utilization and
increases throughput.

diff --git a/src/WINNT/afsd/cm_cell.c b/src/WINNT/afsd/cm_cell.c
index 85d6dfb20b3bb0077e775e5c19ac4a647d9aa306..22a1bd613b83eac263d29f0b56e20893844f5af6 100644 (file)
--- a/src/WINNT/afsd/cm_cell.c
+++ b/src/WINNT/afsd/cm_cell.c
@@ -124,12 +124,15 @@ cm_cell_t *cm_GetCell_Gen(char *namep, char *newnamep, afs_uint32 flags)
     long code;
     char fullname[200]="";
     int  hasWriteLock = 0;
+    afs_uint32 hash;
 
     if (!strcmp(namep,SMB_IOCTL_FILENAME_NOSLASH))
         return NULL;
 
+    hash = CM_CELL_NAME_HASH(namep);
+
     lock_ObtainRead(&cm_cellLock);
-    for (cp = cm_data.allCellsp; cp; cp=cp->nextp) {
+    for (cp = cm_data.cellNameHashTablep[hash]; cp; cp=cp->nameNextp) {
         if (stricmp(namep, cp->name) == 0) {
             strcpy(fullname, cp->name);
             break;
@@ -146,7 +149,7 @@ cm_cell_t *cm_GetCell_Gen(char *namep, char *newnamep, afs_uint32 flags)
         /* when we dropped the lock the cell could have been added
          * to the list so check again while holding the write lock 
          */
-        for (cp = cm_data.allCellsp; cp; cp=cp->nextp) {
+        for (cp = cm_data.cellNameHashTablep[hash]; cp; cp=cp->nameNextp) {
             if (stricmp(namep, cp->name) == 0) {
                 strcpy(fullname, cp->name);
                 break;
@@ -202,7 +205,8 @@ cm_cell_t *cm_GetCell_Gen(char *namep, char *newnamep, afs_uint32 flags)
          * we should use it instead of completing the allocation
          * of a new cm_cell_t 
          */
-        for (cp2 = cm_data.allCellsp; cp2; cp2=cp2->nextp) {
+        hash = CM_CELL_NAME_HASH(fullname);
+        for (cp2 = cm_data.cellNameHashTablep[hash]; cp2; cp2=cp2->nameNextp) {
             if (stricmp(fullname, cp2->name) == 0) {
                 break;
             }
@@ -225,18 +229,21 @@ cm_cell_t *cm_GetCell_Gen(char *namep, char *newnamep, afs_uint32 flags)
         strncpy(cp->name, fullname, CELL_MAXNAMELEN);
         cp->name[CELL_MAXNAMELEN-1] = '\0';
 
-        /* append cell to global list */
+        /* the cellID cannot be 0 */
+        cp->cellID = ++cm_data.currentCells;
+
+               /* append cell to global list */
         if (cm_data.allCellsp == NULL) {
             cm_data.allCellsp = cp;
         } else {
-            for (cp2 = cm_data.allCellsp; cp2->nextp; cp2=cp2->nextp)
+            for (cp2 = cm_data.allCellsp; cp2->allNextp; cp2=cp2->allNextp)
                 ;
-            cp2->nextp = cp;
+            cp2->allNextp = cp;
         }
-        cp->nextp = NULL;
-           
-        /* the cellID cannot be 0 */
-        cp->cellID = ++cm_data.currentCells;
+        cp->allNextp = NULL;
+
+        cm_AddCellToNameHashTable(cp);
+        cm_AddCellToIDHashTable(cp);           
     }
 
   done:
@@ -253,9 +260,13 @@ cm_cell_t *cm_GetCell_Gen(char *namep, char *newnamep, afs_uint32 flags)
 cm_cell_t *cm_FindCellByID(afs_int32 cellID)
 {
     cm_cell_t *cp;
+    afs_uint32 hash;
 
     lock_ObtainRead(&cm_cellLock);
-    for (cp = cm_data.allCellsp; cp; cp=cp->nextp) {
+
+    hash = CM_CELL_ID_HASH(cellID);
+
+    for (cp = cm_data.cellIDHashTablep[hash]; cp; cp=cp->idNextp) {
         if (cellID == cp->cellID) 
             break;
     }
@@ -273,7 +284,7 @@ cm_ValidateCell(void)
     cm_cell_t * cellp;
     afs_uint32 count;
 
-    for (cellp = cm_data.allCellsp, count = 0; cellp; cellp=cellp->nextp, count++) {
+    for (cellp = cm_data.allCellsp, count = 0; cellp; cellp=cellp->allNextp, count++) {
         if ( cellp->magic != CM_CELL_MAGIC ) {
             afsi_log("cm_ValidateCell failure: cellp->magic != CM_CELL_MAGIC");
             fprintf(stderr, "cm_ValidateCell failure: cellp->magic != CM_CELL_MAGIC\n");
@@ -302,7 +313,7 @@ cm_ShutdownCell(void)
 {
     cm_cell_t * cellp;
 
-    for (cellp = cm_data.allCellsp; cellp; cellp=cellp->nextp)
+    for (cellp = cm_data.allCellsp; cellp; cellp=cellp->allNextp)
         lock_FinalizeMutex(&cellp->mx);
 
     return 0;
@@ -322,6 +333,8 @@ void cm_InitCell(int newFile, long maxCells)
             cm_data.allCellsp = NULL;
             cm_data.currentCells = 0;
             cm_data.maxCells = maxCells;
+            memset(cm_data.cellNameHashTablep, 0, sizeof(cm_cell_t *) * cm_data.cellHashTableSize);
+            memset(cm_data.cellIDHashTablep, 0, sizeof(cm_cell_t *) * cm_data.cellHashTableSize);
         
 #ifdef AFS_FREELANCE_CLIENT
             /* Generate a dummy entry for the Freelance cell whether or not 
@@ -338,7 +351,7 @@ void cm_InitCell(int newFile, long maxCells)
             strncpy(cellp->name, "Freelance.Local.Cell", CELL_MAXNAMELEN); /*safe*/
 
             /* thread on global list */
-            cellp->nextp = cm_data.allCellsp;
+            cellp->allNextp = cm_data.allCellsp;
             cm_data.allCellsp = cellp;
                 
             cellp->cellID = AFS_FAKE_ROOT_CELL_ID;
@@ -346,7 +359,7 @@ void cm_InitCell(int newFile, long maxCells)
             cellp->flags = CM_CELLFLAG_FREELANCE;
 #endif  
         } else {
-            for (cellp = cm_data.allCellsp; cellp; cellp=cellp->nextp) {
+            for (cellp = cm_data.allCellsp; cellp; cellp=cellp->allNextp) {
                 lock_InitializeMutex(&cellp->mx, "cm_cell_t mutex");
                 cellp->vlServersp = NULL;
             }
@@ -386,7 +399,7 @@ int cm_DumpCells(FILE *outputFile, char *cookie, int lock)
             cookie, cm_data.currentCells, cm_data.maxCells);
     WriteFile(outputFile, output, (DWORD)strlen(output), &zilch, NULL);
 
-    for (cellp = cm_data.allCellsp; cellp; cellp=cellp->nextp) {
+    for (cellp = cm_data.allCellsp; cellp; cellp=cellp->allNextp) {
         sprintf(output, "%s cellp=0x%p,name=%s ID=%d flags=0x%x\r\n", 
                 cookie, cellp, cellp->name, cellp->cellID, cellp->flags);
         WriteFile(outputFile, output, (DWORD)strlen(output), &zilch, NULL);
@@ -401,3 +414,79 @@ int cm_DumpCells(FILE *outputFile, char *cookie, int lock)
     return(0);
 }
 
+/* call with volume write-locked and mutex held */
+void cm_AddCellToNameHashTable(cm_cell_t *cellp)
+{
+    int i;
+    
+    if (cellp->flags & CM_CELLFLAG_IN_NAMEHASH)
+        return;
+
+    i = CM_CELL_NAME_HASH(cellp->name);
+
+    cellp->nameNextp = cm_data.cellNameHashTablep[i];
+    cm_data.cellNameHashTablep[i] = cellp;
+    cellp->flags |= CM_CELLFLAG_IN_NAMEHASH;
+}
+
+/* call with cell write-locked and mutex held */
+void cm_RemoveCellFromNameHashTable(cm_cell_t *cellp)
+{
+    cm_cell_t **lcellpp;
+    cm_cell_t *tcellp;
+    int i;
+       
+    if (cellp->flags & CM_CELLFLAG_IN_NAMEHASH) {
+       /* hash it out first */
+       i = CM_CELL_NAME_HASH(cellp->name);
+       for (lcellpp = &cm_data.cellNameHashTablep[i], tcellp = cm_data.cellNameHashTablep[i];
+            tcellp;
+            lcellpp = &tcellp->nameNextp, tcellp = tcellp->nameNextp) {
+           if (tcellp == cellp) {
+               *lcellpp = cellp->nameNextp;
+               cellp->flags &= ~CM_CELLFLAG_IN_NAMEHASH;
+                cellp->nameNextp = NULL;
+               break;
+           }
+       }
+    }
+}
+
+/* call with cell write-locked and mutex held */
+void cm_AddCellToIDHashTable(cm_cell_t *cellp)
+{
+    int i;
+    
+    if (cellp->flags & CM_CELLFLAG_IN_IDHASH)
+        return;
+
+    i = CM_CELL_ID_HASH(cellp->cellID);
+
+    cellp->idNextp = cm_data.cellIDHashTablep[i];
+    cm_data.cellIDHashTablep[i] = cellp;
+    cellp->flags |= CM_CELLFLAG_IN_IDHASH;
+}
+
+/* call with cell write-locked and mutex held */
+void cm_RemoveCellFromIDHashTable(cm_cell_t *cellp)
+{
+    cm_cell_t **lcellpp;
+    cm_cell_t *tcellp;
+    int i;
+       
+    if (cellp->flags & CM_CELLFLAG_IN_IDHASH) {
+       /* hash it out first */
+       i = CM_CELL_ID_HASH(cellp->cellID);
+       for (lcellpp = &cm_data.cellIDHashTablep[i], tcellp = cm_data.cellIDHashTablep[i];
+            tcellp;
+            lcellpp = &tcellp->idNextp, tcellp = tcellp->idNextp) {
+           if (tcellp == cellp) {
+               *lcellpp = cellp->idNextp;
+               cellp->flags &= ~CM_CELLFLAG_IN_IDHASH;
+                cellp->idNextp = NULL;
+               break;
+           }
+       }
+    }
+}
+

diff --git a/src/WINNT/afsd/cm_cell.h b/src/WINNT/afsd/cm_cell.h
index 0652e2ac3e9b0bf5c55695b8032dfd766c28655a..02a9caee2512abb0d69679959e849703d792671c 100644 (file)
--- a/src/WINNT/afsd/cm_cell.h
+++ b/src/WINNT/afsd/cm_cell.h
@@ -20,7 +20,9 @@
 typedef struct cm_cell {        
     afs_uint32  magic;
     afs_int32 cellID;                  /* cell ID */
-    struct cm_cell *nextp;             /* locked by cm_cellLock */
+    struct cm_cell *allNextp;          /* locked by cm_cellLock */
+    struct cm_cell *nameNextp;         /* locked by cm_cellLock */
+    struct cm_cell *idNextp;           /* locked by cm_cellLock */
     char name[CELL_MAXNAMELEN];         /* cell name; never changes */
     cm_serverRef_t *vlServersp;         /* locked by cm_serverLock */
     osi_mutex_t mx;                    /* mutex locking fields (flags) */
@@ -29,10 +31,16 @@ typedef struct cm_cell {
 } cm_cell_t;
 
 /* These are bit flag values */
-#define CM_CELLFLAG_SUID            1  /* setuid flag; not yet used */
-#define CM_CELLFLAG_DNS              2  /* cell servers are from DNS */
-#define CM_CELLFLAG_VLSERVER_INVALID 4  /* cell servers are invalid */
-#define CM_CELLFLAG_FREELANCE        8  /* local freelance fake cell */
+#define CM_CELLFLAG_SUID              1        /* setuid flag; not yet used */
+#define CM_CELLFLAG_DNS                2  /* cell servers are from DNS */
+#define CM_CELLFLAG_VLSERVER_INVALID   4  /* cell servers are invalid */
+#define CM_CELLFLAG_FREELANCE          8  /* local freelance fake cell */
+#define CM_CELLFLAG_IN_NAMEHASH        0x10
+#define CM_CELLFLAG_IN_IDHASH          0x20
+
+#define CM_CELL_NAME_HASH(name)  (SDBMHash(name) % cm_data.cellHashTableSize)
+
+#define CM_CELL_ID_HASH(id)   ((unsigned long) id % cm_data.cellHashTableSize)
 
 extern void cm_InitCell(int newFile, long maxCells);
 
@@ -54,4 +62,8 @@ extern cm_cell_t *cm_allCellsp;
 
 extern int cm_DumpCells(FILE *, char *, int);
 
+extern void cm_AddCellToNameHashTable(cm_cell_t * cellp);
+
+extern void cm_AddCellToIDHashTable(cm_cell_t * cellp);
+
 #endif /* __CELL_H_ENV_ */

diff --git a/src/WINNT/afsd/cm_ioctl.c b/src/WINNT/afsd/cm_ioctl.c
index 318360ad3f543c9ceceea95d6275b1b750e61e8b..caaae58825cac62b928e1d64ef0cdf07a1c69d21 100644 (file)
--- a/src/WINNT/afsd/cm_ioctl.c
+++ b/src/WINNT/afsd/cm_ioctl.c
@@ -1250,7 +1250,7 @@ long cm_IoctlGetCell(struct smb_ioctl *ioctlp, struct cm_user *userp)
     }
 
     lock_ObtainRead(&cm_cellLock);
-    for (tcellp = cm_data.allCellsp; tcellp; tcellp = tcellp->nextp) {
+    for (tcellp = cm_data.allCellsp; tcellp; tcellp = tcellp->allNextp) {
         if (whichCell == 0) break;
         whichCell--;
     }
@@ -1307,7 +1307,7 @@ long cm_IoctlNewCell(struct smb_ioctl *ioctlp, struct cm_user *userp)
     cm_SkipIoctlPath(ioctlp);
     lock_ObtainWrite(&cm_cellLock);
   
-    for (cp = cm_data.allCellsp; cp; cp=cp->nextp) 
+    for (cp = cm_data.allCellsp; cp; cp=cp->allNextp) 
     {
         long code;
        lock_ObtainMutex(&cp->mx);

diff --git a/src/WINNT/afsd/cm_memmap.c b/src/WINNT/afsd/cm_memmap.c
index 5a83ee21d05fda269158e1bb05d5fae6cb5c9469..45479e9d378b606e077cc077565909132b135b4b 100644 (file)
--- a/src/WINNT/afsd/cm_memmap.c
+++ b/src/WINNT/afsd/cm_memmap.c
@@ -38,6 +38,14 @@ ComputeSizeOfVolumes(DWORD maxvols)
     return size;
 }
 
+afs_uint64
+ComputeSizeOfCellHT(DWORD maxcells)
+{
+    afs_uint64 size;
+    size = osi_PrimeLessThan((afs_uint32)(maxcells/7 + 1)) * sizeof(cm_cell_t *);
+    return size;
+}
+
 afs_uint64
 ComputeSizeOfVolumeHT(DWORD maxvols)
 {
@@ -119,6 +127,7 @@ ComputeSizeOfMappingFile(DWORD stats, DWORD maxVols, DWORD maxCells, DWORD chunk
                +  ComputeSizeOfVolumes(maxVols) 
                +  4 * ComputeSizeOfVolumeHT(maxVols) 
                +  ComputeSizeOfCells(maxCells) 
+               +  2 * ComputeSizeOfCellHT(maxCells)
                +  ComputeSizeOfACLCache(stats)
                +  ComputeSizeOfSCache(stats)
                +  ComputeSizeOfSCacheHT(stats)
@@ -233,6 +242,7 @@ cm_ShutdownMappedMemory(void)
     afsi_log("  volumeHashTableSize = %d", cm_data.volumeHashTableSize);
     afsi_log("  currentVolumes = %d", cm_data.currentVolumes);
     afsi_log("  maxVolumes     = %d", cm_data.maxVolumes);
+    afsi_log("  cellHashTableSize = %d", cm_data.cellHashTableSize);
     afsi_log("  currentCells   = %d", cm_data.currentCells);
     afsi_log("  maxCells       = %d", cm_data.maxCells);
     afsi_log("  scacheHashTableSize  = %d", cm_data.scacheHashTableSize);
@@ -417,6 +427,7 @@ cm_ValidateMappedMemory(char * cachePath)
     fprintf(stderr,"  volumeHashTableSize = %d", config_data_p->volumeHashTableSize);
     fprintf(stderr,"  currentVolumes = %d\n", config_data_p->currentVolumes);
     fprintf(stderr,"  maxVolumes     = %d\n", config_data_p->maxVolumes);
+    fprintf(stderr,"  cellHashTableSize = %d", config_data_p->cellHashTableSize);
     fprintf(stderr,"  currentCells   = %d\n", config_data_p->currentCells);
     fprintf(stderr,"  maxCells       = %d\n", config_data_p->maxCells);
     fprintf(stderr,"  scacheHashTableSize  = %d\n", config_data_p->scacheHashTableSize);
@@ -816,6 +827,7 @@ cm_InitMappedMemory(DWORD virtualCache, char * cachePath, DWORD stats, DWORD chu
        afsi_log("  volumeHashTableSize  = %d", config_data_p->volumeHashTableSize);
        afsi_log("  currentVolumes = %d", config_data_p->currentVolumes);
        afsi_log("  maxVolumes     = %d", config_data_p->maxVolumes);
+        afsi_log("  cellHashTableSize = %d", config_data_p->cellHashTableSize);
        afsi_log("  currentCells   = %d", config_data_p->currentCells);
        afsi_log("  maxCells       = %d", config_data_p->maxCells);
        afsi_log("  scacheHashTableSize  = %d", config_data_p->scacheHashTableSize);
@@ -841,6 +853,7 @@ cm_InitMappedMemory(DWORD virtualCache, char * cachePath, DWORD stats, DWORD chu
         cm_data.bufferSize = mappingSize;
         cm_data.scacheHashTableSize = osi_PrimeLessThan(stats / 2 + 1);
         cm_data.volumeHashTableSize = osi_PrimeLessThan((afs_uint32)(maxVols/7 + 1));
+        cm_data.cellHashTableSize = osi_PrimeLessThan((afs_uint32)(maxCells/7 + 1));
         if (virtualCache) {
             cm_data.cacheType = CM_BUF_CACHETYPE_VIRTUAL;
         } else {
@@ -865,6 +878,10 @@ cm_InitMappedMemory(DWORD virtualCache, char * cachePath, DWORD stats, DWORD chu
         baseAddress += ComputeSizeOfVolumeHT(maxVols);
         cm_data.volumeBKIDHashTablep = (cm_volume_t **)baseAddress;
         baseAddress += ComputeSizeOfVolumeHT(maxVols);
+        cm_data.cellNameHashTablep = (cm_cell_t **)baseAddress;
+        baseAddress += ComputeSizeOfCellHT(maxCells);
+        cm_data.cellIDHashTablep = (cm_cell_t **)baseAddress;
+        baseAddress += ComputeSizeOfCellHT(maxCells);
         cm_data.cellBaseAddress = (cm_cell_t *) baseAddress;
         baseAddress += ComputeSizeOfCells(maxCells);
         cm_data.aclBaseAddress = (cm_aclent_t *) baseAddress;

diff --git a/src/WINNT/afsd/cm_memmap.h b/src/WINNT/afsd/cm_memmap.h
index 5a6775a5a151e47d94270857c93bd72f150b3880..1233f87ad6ce5f018b80a9ec4746eac79f954329 100644 (file)
--- a/src/WINNT/afsd/cm_memmap.h
+++ b/src/WINNT/afsd/cm_memmap.h
@@ -60,6 +60,10 @@ typedef struct cm_config_data {
     cm_scache_t *       scacheLRUFirstp;
     cm_scache_t *       scacheLRULastp;
 
+    cm_cell_t   **      cellNameHashTablep;
+    cm_cell_t   **      cellIDHashTablep;
+    afs_uint32          cellHashTableSize;
+
     cm_volume_t **      volumeNameHashTablep;
     cm_volume_t **      volumeRWIDHashTablep;
     cm_volume_t **      volumeROIDHashTablep;