TAKE2[PATCH BUG:213 1/1] Support for Process State Dump

Support for process state dump.

Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 213 (Support for process state dump)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=213

1 files changed, 171 insertions, 0 deletions

diff --git a/libglusterfs/src/stack.c b/libglusterfs/src/stack.c
new file mode 100644
index 000000000..453248479
--- /dev/null
+++ b/libglusterfs/src/stack.c
@@ -0,0 +1,171 @@
+/*
+  Copyright (c) 2009 Z RESEARCH, Inc. <http://www.zresearch.com>
+  This file is part of GlusterFS.
+
+  GlusterFS is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published
+  by the Free Software Foundation; either version 3 of the License,
+  or (at your option) any later version.
+
+  GlusterFS is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see
+  <http://www.gnu.org/licenses/>.
+*/
+
+#include "statedump.h"
+#include "stack.h"
+
+static inline
+int call_frames_count (call_frame_t *call_frame) 
+{
+        call_frame_t *pos;
+        int32_t count = 0;
+
+        if (!call_frame)
+                return count;
+
+        for (pos = call_frame; pos != NULL; pos = pos->next)
+                count++;
+
+        return count;
+}
+
+void
+gf_proc_dump_call_frame (call_frame_t *call_frame, const char *key_buf,...)
+{
+    
+        char prefix[GF_DUMP_MAX_BUF_LEN];
+        va_list ap;
+        char key[GF_DUMP_MAX_BUF_LEN];
+        call_frame_t my_frame;
+        int  ret = -1;
+
+        if (!call_frame)
+                return;
+
+        assert(key_buf);
+
+        memset(prefix, 0, sizeof(prefix));
+        memset(&my_frame, 0, sizeof(my_frame));
+        va_start(ap, key_buf);
+        vsnprintf(prefix, GF_DUMP_MAX_BUF_LEN, key_buf, ap); 
+        va_end(ap);
+
+        ret = TRY_LOCK(&call_frame->lock);
+        if (ret) {
+                gf_log("", GF_LOG_WARNING, "Unable to dump call frame"
+                " errno: %d", errno);
+                return;
+        }
+
+        memcpy(&my_frame, call_frame, sizeof(my_frame));
+        UNLOCK(&call_frame->lock);
+
+	gf_proc_dump_build_key(key, prefix,"ref_count");
+        gf_proc_dump_write(key, "%d", my_frame.ref_count);
+	gf_proc_dump_build_key(key, prefix,"translator");
+        gf_proc_dump_write(key, "%s", my_frame.this->name);
+	gf_proc_dump_build_key(key, prefix,"complete");
+        gf_proc_dump_write(key, "%d", my_frame.complete);
+        if (my_frame.parent) {
+                gf_proc_dump_build_key(key, prefix,"parent");
+                gf_proc_dump_write(key, "%s", my_frame.parent->this->name);
+        }
+}
+
+
+void
+gf_proc_dump_call_stack (call_stack_t *call_stack, const char *key_buf,...)
+{
+        char prefix[GF_DUMP_MAX_BUF_LEN];
+        va_list ap;
+        call_frame_t *trav;
+        int32_t cnt, i;
+        char key[GF_DUMP_MAX_BUF_LEN];
+
+        if (!call_stack)
+                return;
+
+        assert(key_buf);
+
+        cnt = call_frames_count(&call_stack->frames);
+
+        memset(prefix, 0, sizeof(prefix));
+        va_start(ap, key_buf);
+        vsnprintf(prefix, GF_DUMP_MAX_BUF_LEN, key_buf, ap); 
+        va_end(ap);
+
+	gf_proc_dump_build_key(key, prefix,"uid");
+        gf_proc_dump_write(key, "%d", call_stack->uid);
+	gf_proc_dump_build_key(key, prefix,"gid");
+        gf_proc_dump_write(key, "%d", call_stack->gid);
+	gf_proc_dump_build_key(key, prefix,"pid");
+        gf_proc_dump_write(key, "%d", call_stack->pid);
+	gf_proc_dump_build_key(key, prefix,"unique");
+        gf_proc_dump_write(key, "%Ld", call_stack->unique);
+
+	gf_proc_dump_build_key(key, prefix,"op");
+        if ((call_stack->type == GF_OP_TYPE_FOP_REQUEST) ||
+                (call_stack->type == GF_OP_TYPE_FOP_REPLY)) {
+                gf_proc_dump_write(key, "%s", gf_fop_list[call_stack->op]);
+        } else if ((call_stack->type == GF_OP_TYPE_MOP_REQUEST) ||
+                (call_stack->type == GF_OP_TYPE_MOP_REPLY)) {
+                gf_proc_dump_write(key, "%s", gf_mop_list[call_stack->op]);
+        } else if ((call_stack->type == GF_OP_TYPE_CBK_REQUEST) ||
+                (call_stack->type == GF_OP_TYPE_CBK_REPLY)) {
+                gf_proc_dump_write(key, "%s", gf_cbk_list[call_stack->op]);
+        }
+    
+	gf_proc_dump_build_key(key, prefix,"type");
+        gf_proc_dump_write(key, "%d", call_stack->type);
+	gf_proc_dump_build_key(key, prefix,"cnt");
+        gf_proc_dump_write(key, "%d", cnt);
+
+        trav = &call_stack->frames;
+
+        for (i = 1; i <= cnt; i++) {
+                if (trav) {
+                        gf_proc_dump_add_section("%s.frame.%d", prefix, i);
+                        gf_proc_dump_call_frame(trav, "%s.frame.%d", prefix, i);
+                        trav = trav->next; 
+                }
+        }
+}
+
+void
+gf_proc_dump_pending_frames (call_pool_t *call_pool)
+{
+		
+        call_stack_t     *trav = NULL;
+        int              i = 1;
+        int              ret = -1;
+
+        if (!call_pool)
+                return;
+
+        ret = TRY_LOCK (&(call_pool->lock));
+        if (ret) {
+                gf_log("", GF_LOG_WARNING, "Unable to dump call pool"
+                " errno: %d", errno);
+                return;
+        }
+
+        
+        gf_proc_dump_add_section("global.callpool");
+        gf_proc_dump_write("global.callpool","%p", call_pool);
+        gf_proc_dump_write("global.callpool.cnt","%d", call_pool->cnt);
+
+
+        list_for_each_entry (trav, &call_pool->all_frames, all_frames) {
+                gf_proc_dump_add_section("global.callpool.stack.%d",i);
+                gf_proc_dump_call_stack(trav, "global.callpool.stack.%d", i);
+                i++;
+        }
+	UNLOCK (&(call_pool->lock));
+}
+