Changeset 635 for trunk/kernel/syscalls/sys_exec.c

Timestamp:

Jun 26, 2019, 11:42:37 AM (5 years ago)

Author:

alain

Message:

This version is a major evolution: The physical memory allocators,
defined in the kmem.c, ppm.c, and kcm.c files have been modified
to support remote accesses. The RPCs that were previously user
to allocate physical memory in a remote cluster have been removed.
This has been done to cure a dead-lock in case of concurrent page-faults.

This version 2.2 has been tested on a (4 clusters / 2 cores per cluster)
TSAR architecture, for both the "sort" and the "fft" applications.

File:

• trunk/kernel/syscalls/sys_exec.c (modified) (2 diffs)

trunk/kernel/syscalls/sys_exec.c

@@ -63 +63 @@
     uint32_t     length;      // string length
     kmem_req_t   req;         // kmem request
-    page_t     * page;        // page descriptor
-    xptr_t       base_xp;     // extended pointer on page base
     uint32_t     order;       // ln2( number of pages to store strings )
     char      ** k_pointers;  // base of kernel array of pointers
+    char       * k_buf_base;  // base address of the kernel strings buffer
     char       * k_buf_ptr;   // pointer on first empty slot in kernel strings buffer
-    char       * k_buf_base;  // base address of the kernel strings buffer
 
     // compute ln2( number of pages for kernel strings buffer )
@@ -74 +72 @@
     else          order = bits_log2( CONFIG_VMM_ENVS_SIZE );
 
-    req.type   = KMEM_PAGE;
+    // allocate one physical page for kernel array of pointers
+    req.type   = KMEM_PPM;
+    req.order  = 0;
     req.flags  = AF_KERNEL | AF_ZERO;
-
-    // allocate one physical page for kernel array of pointers
-    req.type   = 0;
-    page       = kmem_alloc( &req );
-
-    if( page == NULL ) return ENOMEM;
-
-    base_xp = ppm_page2base( XPTR( local_cxy , page ) );
-    k_pointers = (char **)GET_PTR( base_xp );
+    k_pointers = kmem_alloc( &req );
+
+    if( k_pointers == NULL ) return ENOMEM;
 
     // allocate several physical pages to store the strings themselve
-    req.type   = order;
-    page       = kmem_alloc( &req );
-
-    if( page == NULL ) return ENOMEM;
-
-    base_xp = ppm_page2base( XPTR( local_cxy , page ) );
-    k_buf_base = (char *)GET_PTR( base_xp );
+    req.type   = KMEM_PPM;
+    req.order  = order;
+    req.flags  = AF_KERNEL | AF_ZERO;
+    k_buf_base = kmem_alloc( &req );
+
+    if( k_buf_base == NULL ) return ENOMEM;
 
     // copy the array of pointers to kernel buffer