eal: allow hugetlbfs sub-directories
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Commit Message
get_hugepage_dir() was implemented in such a way that a --huge-dir option had to
exactly match the mountpoint, but there's no reason for this restriction. Fix
the implementation to allow a sub-directory within a suitable hugetlbfs
mountpoint to be specified, preferring the closest match.
Signed-off-by: John Levon <john.levon@nutanix.com>
---
lib/eal/linux/eal_hugepage_info.c | 74 +++++++++++++++++++++----------
1 file changed, 51 insertions(+), 23 deletions(-)
@@ -213,8 +213,8 @@ get_hugepage_dir(uint64_t hugepage_sz, char *hugedir, int len)
const size_t pagesize_opt_len = sizeof(pagesize_opt) - 1;
const char split_tok = ' ';
char *splitstr[_FIELDNAME_MAX];
+ char found[PATH_MAX] = "";
char buf[BUFSIZ];
- int retval = -1;
const struct internal_config *internal_conf =
eal_get_internal_configuration();
@@ -226,42 +226,70 @@ get_hugepage_dir(uint64_t hugepage_sz, char *hugedir, int len)
default_size = get_default_hp_size();
while (fgets(buf, sizeof(buf), fd)){
+ const char *pagesz_str;
+
if (rte_strsplit(buf, sizeof(buf), splitstr, _FIELDNAME_MAX,
split_tok) != _FIELDNAME_MAX) {
RTE_LOG(ERR, EAL, "Error parsing %s\n", proc_mounts);
break; /* return NULL */
}
- /* we have a specified --huge-dir option, only examine that dir */
- if (internal_conf->hugepage_dir != NULL &&
- strcmp(splitstr[MOUNTPT], internal_conf->hugepage_dir) != 0)
+ if (strncmp(splitstr[FSTYPE], hugetlbfs_str, htlbfs_str_len) != 0) {
continue;
+ }
- if (strncmp(splitstr[FSTYPE], hugetlbfs_str, htlbfs_str_len) == 0){
- const char *pagesz_str = strstr(splitstr[OPTIONS], pagesize_opt);
+ pagesz_str = strstr(splitstr[OPTIONS], pagesize_opt);
- /* if no explicit page size, the default page size is compared */
- if (pagesz_str == NULL){
- if (hugepage_sz == default_size){
- strlcpy(hugedir, splitstr[MOUNTPT], len);
- retval = 0;
- break;
- }
+ /* if no explicit page size, the default page size is compared */
+ if (pagesz_str == NULL) {
+ if (hugepage_sz != default_size) {
+ continue;
}
- /* there is an explicit page size, so check it */
- else {
- uint64_t pagesz = rte_str_to_size(&pagesz_str[pagesize_opt_len]);
- if (pagesz == hugepage_sz) {
- strlcpy(hugedir, splitstr[MOUNTPT], len);
- retval = 0;
- break;
- }
+ }
+ /* there is an explicit page size, so check it */
+ else {
+ uint64_t pagesz = rte_str_to_size(&pagesz_str[pagesize_opt_len]);
+ if (pagesz != hugepage_sz) {
+ continue;
}
- } /* end if strncmp hugetlbfs */
+ }
+
+ /*
+ * If no --huge-dir option has been given, we're done.
+ */
+ if (internal_conf->hugepage_dir == NULL) {
+ strlcpy(found, splitstr[MOUNTPT], len);
+ break;
+ }
+
+ /*
+ * Ignore any mount that doesn't contain the --huge-dir
+ * directory.
+ */
+ if (strncmp(internal_conf->hugepage_dir, splitstr[MOUNTPT],
+ strlen(splitstr[MOUNTPT])) != 0) {
+ continue;
+ }
+
+ /*
+ * We found a match, but only prefer it if it's a longer match
+ * (so /mnt/1 is preferred over /mnt for matching /mnt/1/2)).
+ */
+ if (strlen(splitstr[MOUNTPT]) > strlen(found)) {
+ strlcpy(found, splitstr[MOUNTPT], len);
+ }
} /* end while fgets */
fclose(fd);
- return retval;
+
+ if (found[0] != '\0') {
+ /* If needed, return the requested dir, not the mount point. */
+ strlcpy(hugedir, internal_conf->hugepage_dir != NULL ?
+ internal_conf->hugepage_dir : found, len);
+ return 0;
+ }
+
+ return -1;
}
/*