HVM capability enhancement: asynchronous upcalls to ROS userspace

[palacios.git] / linux_usr / v3_mem.c

diff --git a/linux_usr/v3_mem.c b/linux_usr/v3_mem.c
index 93a511f..1d987fc 100644 (file)
--- a/linux_usr/v3_mem.c
+++ b/linux_usr/v3_mem.c
@@ -17,6 +17,12 @@
 
 #include "v3_ctrl.h"
 
+// set to zero to ignore, or set
+// to a level likely given the largest contiguous
+// page allocation outside of the base regions
+// note that the seed pools provide 2-4 MB chunks
+// to start
+#define PALACIOS_MIN_ALLOC (64*4096)
 
 #define SYS_PATH "/sys/devices/system/memory/"
 
@@ -153,24 +159,19 @@ int main(int argc, char * argv[]) {
     }
 
     if (op==ADD) {
-       mem_size_bytes = atoll(argv[optind]) * (1024 * 1024);
+       mem_size_bytes = (unsigned long long) (atof(argv[optind]) * (1024 * 1024));
 
-       if (mem_size_bytes > palacios_runtime_mem_block_size) { 
-           EPRINTF("Trying to add a larger single chunk of memory than Palacios can manage\n"
+       if (mem_size_bytes < palacios_runtime_mem_block_size ||
+           (PALACIOS_MIN_ALLOC!=0 && mem_size_bytes < PALACIOS_MIN_ALLOC)) {
+           EPRINTF("Trying to add a smaller single chunk of memory than Palacios needs\n"
                   "Your request:                        %llu bytes\n"
                   "Palacios run-time memory block size: %llu bytes\n",
-                  mem_size_bytes, palacios_runtime_mem_block_size);
+                  "Palacios minimal contiguous alloc:   %llu bytes\n",
+                   mem_size_bytes, palacios_runtime_mem_block_size,
+                   PALACIOS_MIN_ALLOC);
            return -1;
        }
 
-       if (mem_size_bytes < palacios_runtime_mem_block_size) { 
-           EPRINTF("Trying to add a smaller single chunk of memory than Palacios can manage\n"
-                  "Your request:                        %llu bytes\n"
-                  "Palacios run-time memory block size: %llu bytes\n",
-                  mem_size_bytes, palacios_runtime_mem_block_size);
-           return -1;
-       }
-       
        if (request && mem_size_bytes > kernel_max_page_alloc_bytes) { 
            EPRINTF("Trying to request a larger single chunk of memory than the kernel can allocate\n"
                   "Your request:                        %llu bytes\n"
@@ -655,7 +656,7 @@ static int offline_memory(unsigned long long mem_size_bytes,
                    return -1;
                }
 
-               status_buf[BUF_SIZE]=0;
+               status_buf[BUF_SIZE-1]=0;
                
                VPRINTF("Checking offlined block %d (%s)...", i + reg_start, fname);
                
@@ -814,7 +815,7 @@ static int write_offlined()
 
     fclose(off);
     if (!(off=fopen(offname,"w+"))) {  // truncate
-       EPRINTF("Cannot open %s for writing!\n");
+       EPRINTF("Cannot open %s for writing!\n",offname);
        return -1;
     }