performance/io-cache,quick-read: increase cache-size limit

Does the following:
1. Increases cache-size limit from 6GB to 32GB.
2. Prevents 'volume set'from failing when cache-size is set over the
limit. Just issues a warning.
3. Performs check on cache-size by comparing with total system memory
available in init () and reconfigure () methods.

Change-Id: I7dd4d8c53051b89a293696abf1ee8dc237e39a20
BUG: 3495
Reviewed-on: http://review.gluster.com/409
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Amar Tumballi <amar@gluster.com>
Reviewed-by: Vijay Bellur <vijay@gluster.com>

3 files changed, 49 insertions, 6 deletions

diff --git a/libglusterfs/src/common-utils.c b/libglusterfs/src/common-utils.c
index b2e91608b7a..2d4415f506d 100644
--- a/libglusterfs/src/common-utils.c
+++ b/libglusterfs/src/common-utils.c
@@ -1896,3 +1896,34 @@ gf_path_strip_trailing_slashes (char *path)
 
         return;
 }
+
+uint64_t
+get_mem_size ()
+{
+        uint64_t memsize = -1;
+
+#ifdef __linux__
+        FILE *fp = NULL;
+        char    line[1028] = {0,};
+
+        fp = fopen ("/proc/meminfo", "r");
+        if (!fp) {
+                gf_log ("common-utils", GF_LOG_DEBUG,
+                        "Could not open /proc/meminfo");
+                return memsize;
+        }
+
+        while (fgets (line, sizeof (line), fp) != 0) {
+                if (strncmp (line, "MemTotal:", 9) == 0) {
+                        sscanf (line, "%*s %"SCNu64" kB", &memsize);
+                        memsize *= 1024;        //convert to bytes
+                        gf_log ("common-utils", GF_LOG_INFO,
+                                "Total Mem: %"PRIu64, memsize);
+                        break;
+                }
+        }
+#endif
+        // TODO: Methods for other platforms
+
+        return memsize;
+}
diff --git a/libglusterfs/src/common-utils.h b/libglusterfs/src/common-utils.h
index 82e499b392a..2a5e00c5e11 100644
--- a/libglusterfs/src/common-utils.h
+++ b/libglusterfs/src/common-utils.h
@@ -50,6 +50,7 @@ void trap (void);
 #include "uuid.h"
 
 
+
 #define min(a,b) ((a)<(b)?(a):(b))
 #define max(a,b) ((a)>(b)?(a):(b))
 #define roof(a,b) ((((a)+(b)-1)/((b)?(b):1))*(b))
@@ -399,4 +400,5 @@ int validate_brick_name (char *brick);
 char *get_host_name (char *word, char **host);
 char *get_path_name (char *word, char **path);
 void gf_path_strip_trailing_slashes (char *path);
+uint64_t get_mem_size ();
 #endif /* _COMMON_UTILS_H */
diff --git a/libglusterfs/src/options.c b/libglusterfs/src/options.c
index b64b24e0489..1e6413cc0a9 100644
--- a/libglusterfs/src/options.c
+++ b/libglusterfs/src/options.c
@@ -131,12 +131,22 @@ xlator_option_validate_sizet (xlator_t *xl, const char *key, const char *value,
         }
 
         if ((size < opt->min) || (size > opt->max)) {
-                snprintf (errstr, 256,
-                          "'%"PRId64"' in 'option %s %s' is out of range "
-                          "[%"PRId64" - %"PRId64"]",
-                          size, key, value, opt->min, opt->max);
-                gf_log (xl->name, GF_LOG_ERROR, "%s", errstr);
-                goto out;
+                if (strncmp (key, "cache-size", 10) == 0) {
+                       snprintf (errstr, 256, "Cache size %"PRId64" is out of "
+                                 "range [%"PRId64" - %"PRId64"]",
+                                 size, opt->min, opt->max);
+                       //*op_errstr = gf_strdup (errstr);
+                       gf_log (xl->name, GF_LOG_WARNING, "%s", errstr);
+                       ret = 0;
+                       goto out;
+                } else {
+                        snprintf (errstr, 256,
+                                  "'%"PRId64"' in 'option %s %s' "
+                                  "is out of range [%"PRId64" - %"PRId64"]",
+                                  size, key, value, opt->min, opt->max);
+                        gf_log (xl->name, GF_LOG_ERROR, "%s", errstr);
+                        goto out;
+                }
         }
 
         ret = 0;