dump: Add some more comments on page dumping routines

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>

include/parasite-syscall.h

@@ -13,8 +13,8 @@
 
 /* parasite control block */
 struct parasite_ctl {
-	pid_t			pid;			/* process where we live */
-	struct vma_area		*vma_area;		/* our space */
+	pid_t			pid;			/* process pid where we live in */
+	struct vma_area		*vma_area;		/* our space we host */
 	unsigned long		parasite_ip;		/* service routine start ip */
 	unsigned long		parasite_complete_ip;	/* where we end execution */
 	unsigned long		addr_cmd;		/* addr for command */

parasite-syscall.c

@@ -241,6 +241,10 @@ static struct vma_area *get_vma_by_ip(struct list_head *vma_area_list, unsigned
 	return NULL;
 }
 
+/*
+ * This routine drives parasite code (been previously injected into a victim
+ * process) and tells it to dump pages into the file.
+ */
 int parasite_dump_pages_seized(struct parasite_ctl *ctl, struct list_head *vma_area_list,
 			       struct cr_fdset *cr_fdset, int fd_type)
 {

parasite.c

@@ -160,6 +160,10 @@ err_open:
 	return ret;
 }
 
+/*
+ * This is the main page dumping routine, it's executed
+ * inside a victim process space.
+ */
 static int dump_pages(parasite_args_cmd_dumppages_t *args)
 {
 	int ret = PARASITE_ERR_FAIL;