There are currently 11 environment variables that can be used to control the behavior of a program that is executed uses libhugetlbfs. Rather than expect the end user to remember all of the environment variable names and valid values for each. hugectl takes the idea of using a single program as a front end for controlling a very specific target set of applications with a large number of possible variables from numactl and applies it to libhugetlbfs.
Submitting hugectl as a skeleton allows the community to take some time to
consider an interface that will remain mostly constant to the end user while
the underlying environment variable and library behavior changes.
Signed-off-by: Eric B Munson <[EMAIL PROTECTED]>
---
V3
Changes from V2:
Remove all functionality until the community agrees on an ABI
Changes from V1:
Update hugectl to handle the environment variables currently in libhugetlbfs
Comment out huge page backed stack helper, functionality not yet in kernel
hugectl.c | 90 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 90 insertions(+), 0 deletions(-)
diff --git a/hugectl.c b/hugectl.c
new file mode 100644
index 0000000..7894514
--- /dev/null
+++ b/hugectl.c
@@ -0,0 +1,90 @@
+/***************************************************************************
+ * User front end for using huge pages Copyright (C) 2008, IBM *
+ * *
+ * This program is free software; you can redistribute it and/or modify *
+ * it under the terms of the Lesser GNU General Public License as *
+ * published by the Free Software Foundation; either version 2.1 of the *
+ * License, or at your option) any later version. *
+ * *
+ * This program is distributed in the hope that it will be useful, *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
+ * GNU Lesser General Public License for more details. *
+ * *
+ * You should have received a copy of the Lesser GNU General Public *
+ * License along with this program; if not, write to the *
+ * Free Software Foundation, Inc., *
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
+ ***************************************************************************/
+
+/*
+ * hugectl is inspired by numactl as a single front end to a large number of
+ * options for controlling a very specific environment. Eventually it will
+ * have support for controlling the all of the environment variables for
+ * libhugetlbfs, but options will only be added after they have been in the
+ * library for some time and are throughly tested and stable.
+ *
+ * This program should be treated as an ABI for using libhugetlbfs.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+
+#define _GNU_SOURCE /* for getopt_long */
+#include <unistd.h>
+#include <getopt.h>
+
+extern int errno;
+extern int optind;
+extern char *optarg;
+
+void print_usage()
+{
+ fprintf(stderr, "hugectl [options] target\n");
+ fprintf(stderr, "options:\n");
+ fprintf(stderr, " --help, -h Prints this
message.\n");
+}
+
+int main(int argc, char** argv)
+{
+ char opts [] = "+h";
+ int ret = 0, index = 0;
+ struct option long_opts [] = {
+ {"help", 0, 0, 'h'},
+ {0, 0, 0, 0},
+ };
+
+ if (argc < 2) {
+ print_usage();
+ return 0;
+ }
+
+ while (ret != -1) {
+ ret = getopt_long(argc, argv, opts, long_opts, &index);
+ switch (ret) {
+ case '?':
+ case 'h':
+ print_usage();
+ return 0;
+
+ case -1:
+ break;
+
+ default:
+ ret = -1;
+ break;
+ }
+ }
+ index = optind;
+
+ if (execvp(argv[index], &argv[index]) == -1) {
+ ret = errno;
+ fprintf(stderr, "Error calling execvp: '%s'\n", strerror(ret));
+ return ret;
+ }
+
+ return 0;
+}
+
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