[LTP] [PATCH 1/4] add libnuma_helper

[Jan Stancek <jstancek@redhat.com>]

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A library to share NUMA helper functions shared by
multiple testcases.

Signed-off-by: Jan Stancek <jstancek@redhat.com>
---
 testcases/kernel/syscalls/numa/Makefile          |   22 ++++
 testcases/kernel/syscalls/numa/Makefile.inc      |   27 +++++
 testcases/kernel/syscalls/numa/lib/Makefile      |   26 ++++
 testcases/kernel/syscalls/numa/lib/numa_helper.c |  135 ++++++++++++++++++++++
 testcases/kernel/syscalls/numa/lib/numa_helper.h |   34 ++++++
 5 files changed, 244 insertions(+), 0 deletions(-)
 create mode 100644 testcases/kernel/syscalls/numa/Makefile
 create mode 100644 testcases/kernel/syscalls/numa/Makefile.inc
 create mode 100644 testcases/kernel/syscalls/numa/lib/Makefile
 create mode 100644 testcases/kernel/syscalls/numa/lib/numa_helper.c
 create mode 100644 testcases/kernel/syscalls/numa/lib/numa_helper.h



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diff --git a/testcases/kernel/syscalls/numa/Makefile b/testcases/kernel/syscalls/numa/Makefile
new file mode 100644
index 0000000..b38c5b2
--- /dev/null
+++ b/testcases/kernel/syscalls/numa/Makefile
@@ -0,0 +1,22 @@
+#
+#  Copyright (C) 2012 Linux Test Project, Inc.
+#
+#  This program is free software;  you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation; either version 2 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 General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program;  if not, write to the Free Software
+#  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#
+
+top_srcdir		?= ../../../..
+
+include $(top_srcdir)/include/mk/env_pre.mk
+include $(top_srcdir)/include/mk/generic_trunk_target.mk
diff --git a/testcases/kernel/syscalls/numa/Makefile.inc b/testcases/kernel/syscalls/numa/Makefile.inc
new file mode 100644
index 0000000..59c2f9e
--- /dev/null
+++ b/testcases/kernel/syscalls/numa/Makefile.inc
@@ -0,0 +1,27 @@
+#
+#  Copyright (C) 2012 Linux Test Project, Inc.
+#
+#  This program is free software;  you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation; either version 2 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 General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program;  if not, write to the Free Software
+#  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#
+
+CPPFLAGS		+= $(NUMA_CPPFLAGS) -I../numa/lib/
+LIBDIR			:= ../numa/lib
+LIB			:= $(LIBDIR)/libnuma_helper.a
+MAKE_DEPS		+= $(LIB)
+LDLIBS			+= $(NUMA_LIBS) -lnuma_helper -lltp
+LDFLAGS			+= -L$(LIBDIR)
+
+$(LIB): $(LIBDIR)
+		$(MAKE) -C $^ -f "$(abs_srcdir)/$^/Makefile" all
diff --git a/testcases/kernel/syscalls/numa/lib/Makefile b/testcases/kernel/syscalls/numa/lib/Makefile
new file mode 100644
index 0000000..d4a6f41
--- /dev/null
+++ b/testcases/kernel/syscalls/numa/lib/Makefile
@@ -0,0 +1,26 @@
+#
+#  Copyright (C) 2012 Linux Test Project, Inc.
+#
+#  This program is free software;  you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation; either version 2 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 General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program;  if not, write to the Free Software
+#  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#
+
+top_srcdir		?= ../../../../..
+
+include $(top_srcdir)/include/mk/env_pre.mk
+
+CPPFLAGS		+= -I../../../include
+LIB			:= libnuma_helper.a
+
+include $(top_srcdir)/include/mk/lib.mk
diff --git a/testcases/kernel/syscalls/numa/lib/numa_helper.c b/testcases/kernel/syscalls/numa/lib/numa_helper.c
new file mode 100644
index 0000000..441d4eb
--- /dev/null
+++ b/testcases/kernel/syscalls/numa/lib/numa_helper.c
@@ -0,0 +1,135 @@
+/*
+ * Copyright (C) 2012 Linux Test Project, Inc.
+ *
+ * This program is free software;  you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program;  if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "config.h"
+#include <errno.h>
+#if HAVE_NUMA_H
+#include <numa.h>
+#endif
+#if HAVE_NUMAIF_H
+#include <numaif.h>
+#endif
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "test.h"
+#include "usctest.h"
+#include "safe_macros.h"
+#include "numa_helper.h"
+#include "linux_syscall_numbers.h"
+
+/*
+ * get_allowed_nodes_arr - get number and array of available nodes
+ * @num_allowed_nodes: pointer where number of available nodes will be stored
+ * @allowed_nodes: array of available node ids, this is MPOL_F_MEMS_ALLOWED
+ *                 node bitmask compacted (without holes), so that each field
+ *                 contains node number. If NULL only num_allowed_nodes is
+ *                 returned, otherwise it cotains new allocated array,
+ *                 which caller is responsible to free.
+ * RETURNS:
+ *     0 on success
+ *    -1 on allocation failure
+ *    -2 on get_mempolicy failure
+ */
+int get_allowed_nodes_arr(int *num_allowed_nodes, int **allowed_nodes)
+{
+#if HAVE_NUMA_H
+	int i;
+	struct bitmask *allowed_nodemask = NULL;
+#endif
+	*num_allowed_nodes = 0;
+	if (allowed_nodes)
+		*allowed_nodes = NULL;
+
+#if HAVE_NUMA_H
+	if ((allowed_nodemask = numa_allocate_nodemask()) == NULL)
+		return -1;
+
+	if (allowed_nodes) {
+		*allowed_nodes = malloc(sizeof(int)*allowed_nodemask->size);
+		if (*allowed_nodes == NULL)
+			return -1;
+	}
+
+	/*
+	 * avoid numa_get_mems_allowed(), because of bug in getpol()
+	 * utility function in older versions:
+	 * http://www.spinics.net/lists/linux-numa/msg00849.html
+	 */
+	if (syscall(__NR_get_mempolicy, NULL, allowed_nodemask->maskp,
+		allowed_nodemask->size, 0, MPOL_F_MEMS_ALLOWED) < 0) {
+		numa_bitmask_free(allowed_nodemask);
+		if (allowed_nodes) {
+			free(*allowed_nodes);
+			*allowed_nodes = NULL;
+		}
+		return -2;
+	}
+
+	for (i = 0; i <	allowed_nodemask->size; i++) {
+		if (numa_bitmask_isbitset(allowed_nodemask, i)) {
+			if (allowed_nodes)
+				(*allowed_nodes)[*num_allowed_nodes] = i;
+			(*num_allowed_nodes)++;
+		}
+	}
+	numa_bitmask_free(allowed_nodemask);
+#endif
+	return 0;
+}
+
+/*
+ * get_allowed_nodes - convenience function to get fixed number of nodes
+ * @count: how many nodes to get
+ * @...: int pointers, where node ids will be stored
+ * RETURNS:
+ *     0 on success
+ *    -1 on allocation failure
+ *    -2 on get_mempolicy failure
+ *    -3 on not enough allowed nodes
+ */
+int get_allowed_nodes(int count, ...)
+{
+	int ret;
+	int i, *nodep;
+	va_list ap;
+	int num_nodes = 0;
+	int *nodes = NULL;
+
+	if ((ret = get_allowed_nodes_arr(&num_nodes, &nodes)) < 0)
+		return ret;
+
+	va_start(ap, count);
+	for (i = 0; i < count; i++) {
+		nodep = va_arg(ap, int *);
+		if (i < num_nodes) {
+			*nodep = nodes[i];
+		} else {
+			*nodep = -1;
+			ret = -3;
+			tst_resm(TFAIL, "get_allowed_nodes, i >= num_allowed_nodes: "
+			    "%d > %d", i, num_nodes);
+		}
+	}
+	free(nodes);
+	va_end(ap);
+
+	return ret;
+}
diff --git a/testcases/kernel/syscalls/numa/lib/numa_helper.h b/testcases/kernel/syscalls/numa/lib/numa_helper.h
new file mode 100644
index 0000000..73b6513
--- /dev/null
+++ b/testcases/kernel/syscalls/numa/lib/numa_helper.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2012 Linux Test Project, Inc.
+ *
+ * This program is free software;  you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program;  if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef NUMA_HELPER_H
+#define NUMA_HELPER_H
+
+#include "config.h"
+#if HAVE_NUMA_H
+#include <numa.h>
+#endif
+#if HAVE_NUMAIF_H
+#include <numaif.h>
+#endif
+
+int get_allowed_nodes_arr(int *num_allowed_nodes, int **allowed_nodes);
+int get_allowed_nodes(int count, ...);
+
+#endif
+


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