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memory driver: use mmap to pre-allocate ramdisks to avoid overcommit.

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This commit is contained in:
Ben Gras 2010-06-28 18:12:32 +00:00
parent f044bd10ef
commit 635a8f772c
1 changed files with 4 additions and 4 deletions
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8
drivers/memory/memory.c
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@ -445,7 +445,7 @@ message *m_ptr; /* pointer to control message */
panic("huge old ramdisk");
}
size = ex64lo(dv->dv_size);
free((void *) m_vaddrs[dev]);
munmap((void *) m_vaddrs[dev], size);
m_vaddrs[dev] = (vir_bytes) NULL;
}
@ -454,11 +454,11 @@ message *m_ptr; /* pointer to control message */
#endif
/* Try to allocate a piece of memory for the RAM disk. */
if(!(mem = malloc(ramdev_size))) {
if((mem = mmap(NULL, ramdev_size, PROT_READ|PROT_WRITE,
MAP_PREALLOC|MAP_ANON, -1, 0)) == MAP_FAILED) {
printf("MEM: failed to get memory for ramdisk\n");
return(ENOMEM);
}
memset(mem, 0, ramdev_size);
}
m_vaddrs[dev] = (vir_bytes) mem;