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/dev/shm: use Linux PFNs and populate mappings

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Change-Id: I921c1f43c8411f896343be17e0ac6762a1bc26d1
This commit is contained in:
Balazs Gerofi
2019-09-26 13:05:16 +09:00
committed by Masamichi Takagi
parent 5c2f9b8239
commit f8e8b21f04
2 changed files with 35 additions and 6 deletions
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33
executer/kernel/mcctrl/syscall.c
View File

@ -972,20 +972,23 @@ static int pager_req_create(ihk_os_t os, int fd, uintptr_t result_pa)
goto out;
}
/* OpenMPI /tmp shared memory hack */
/* Shared memory hack */
{
char *pathbuf, *fullpath;
pathbuf = kmalloc(PATH_MAX, GFP_ATOMIC);
if (pathbuf) {
fullpath = d_path(&file->f_path, pathbuf, PATH_MAX);
if (!IS_ERR(fullpath)) {
if (!strncmp("/tmp/ompi.", fullpath, 10)) {
if (!strncmp("/tmp/ompi.", fullpath, 10) ||
!strncmp("/dev/shm/", fullpath, 9)) {
dprintk("%s: treating %s as a device file..\n",
__func__, fullpath);
kfree(pathbuf);
error = -ESRCH;
goto out;
}
kfree(pathbuf);
}
}
@ -1430,14 +1433,15 @@ static int pager_req_map(ihk_os_t os, int fd, size_t len, off_t off,
#define ANY_WHERE 0
if (prot_and_flags & MAP_LOCKED) prot_and_flags |= MAP_POPULATE;
/* OpenMPI /tmp shared memory hack */
/* Shared memory hack */
{
char *pathbuf, *fullpath;
pathbuf = kmalloc(PATH_MAX, GFP_ATOMIC);
if (pathbuf) {
fullpath = d_path(&file->f_path, pathbuf, PATH_MAX);
if (!IS_ERR(fullpath)) {
if (!strncmp("/tmp/ompi.", fullpath, 10)) {
if (!strncmp("/tmp/ompi.", fullpath, 10) ||
!strncmp("/dev/shm/", fullpath, 9)) {
dprintk("%s: pre-populating %s..\n",
__func__, fullpath);
prot_and_flags |= MAP_POPULATE;
@ -1614,11 +1618,28 @@ retry:
#else
fault = handle_mm_fault(current->mm, vma, va, flags);
#endif
#ifdef SC_DEBUG
if (fault != 0) {
printk("%s: error: faulting %lx at off: %lu\n",
__FUNCTION__, va, off);
char *pathbuf = NULL;
char *fullpath;
if (vma->vm_file) {
pathbuf = kmalloc(PATH_MAX, GFP_ATOMIC);
if (pathbuf) {
fullpath = d_path(&vma->vm_file->f_path,
pathbuf, PATH_MAX);
if (!IS_ERR(fullpath)) {
printk("%s: WARNING: couldn't fault 0x%lx"
" at off: %lu in %s\n",
__FUNCTION__, va, off, fullpath);
}
kfree(pathbuf);
}
}
}
#endif
page_fault_attempted = 1;
goto retry;
}

8
kernel/syscall.c
View File

@ -1812,6 +1812,7 @@ do_mmap(const uintptr_t addr0, const size_t len0, const int prot,
__func__, flags, memobj->path, memobj->flags, pgshift, p2align);
pgshift = PAGE_SHIFT;
p2align = PAGE_P2ALIGN;
populated_mapping = 1;
}
#ifdef ATTACHED_MIC
/*
@ -1849,6 +1850,13 @@ do_mmap(const uintptr_t addr0, const size_t len0, const int prot,
#ifdef PROFILE_ENABLE
profile_event_add(PROFILE_mmap_device_file, len);
#endif // PROFILE_ENABLE
if (memobj->path &&
(!strncmp("/tmp/ompi.", memobj->path, 10) ||
!strncmp("/dev/shm/", memobj->path, 9))) {
pgshift = PAGE_SHIFT;
p2align = PAGE_P2ALIGN;
populated_mapping = 1;
}
}
}
if (error) {