New version without the magic numbers ...
---
String conversions for memory policy
This patch adds two new functions to mm/mempolicy.c that allow the conversion
of a memory policy to a textual representation and vice versa.
Syntax of textual representation:
default
preferred=<nodenumber>
bind=<nodelist>
interleave=<nodelist>
Signed-off-by: Christoph Lameter <[email protected]>
Index: linux-2.6.13-rc4-mm1/mm/mempolicy.c
===================================================================
--- linux-2.6.13-rc4-mm1.orig/mm/mempolicy.c 2005-08-01 12:59:49.000000000 -0700
+++ linux-2.6.13-rc4-mm1/mm/mempolicy.c 2005-08-01 17:14:08.000000000 -0700
@@ -1170,3 +1170,95 @@
{
sys_set_mempolicy(MPOL_DEFAULT, NULL, 0);
}
+
+static const char *policy_types[] = { "default", "prefer", "bind", "interleave" };
+
+/*
+ * Convert a mempolicy into a string.
+ * Returns the number of characters in buffer (if positive)
+ * or an error (negative)
+ */
+int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol)
+{
+ char *p = buffer;
+ int l;
+ nodemask_t nodes;
+ mode = pol ? pol->policy : MPOL_DEFAULT;
+
+ switch (mode) {
+ case MPOL_DEFAULT:
+ nodes_clear(nodes);
+ break;
+
+ case MPOL_PREFERRED:
+ nodes_clear(nodes);
+ node_set(pol->v.preferred_node, nodes);
+ break;
+
+ case MPOL_BIND:
+ get_zonemask(pol, nodes.bits);
+ break;
+
+ case MPOL_INTERLEAVE:
+ nodes = * (nodemask_t *)pol->v.nodes;
+ break;
+
+ default:
+ BUG();
+ return -EFAULT;
+ }
+
+ l = strlen(policy_types[mode]);
+ if (buffer + maxlen > p + l + 1)
+ return -ENOSPC;
+ strcpy(p, policy_types[mode]);
+ p += l;
+
+ if (!nodes_empty(nodes)) {
+
+ if (buffer + maxlen > p + 2)
+ return -ENOSPC;
+
+ *p++ = '=';
+ p += nodelist_scnprintf(p, buffer + maxlen - p, nodes);
+ }
+ return p - buffer;
+}
+
+/*
+ * Convert a representation of a memory policy from text
+ * form to binary.
+ *
+ * Returns either a memory policy or NULL for error.
+ */
+struct mempolicy *str_to_mpol(char *buffer)
+{
+ nodemask_t nodes;
+ int mode;
+ int l;
+
+ for(mode = 0; mode <= MPOL_MAX; mode++) {
+ l = strlen(policy_types[mode]);
+ if (strnicmp(policy_types[mode], buffer, l)
+ && (mode == MPOL_DEFAULT || buffer[l] == '='))
+ break;
+ }
+
+ if (mode > MPOL_MAX)
+ return NULL;
+
+ if (mode == MPOL_DEFAULT)
+ return &default_policy;
+
+ if (nodelist_parse(buffer + l + 1, nodes) || nodes_empty(nodes))
+ return NULL;
+
+ /* Update current mems_allowed */
+ cpuset_update_current_mems_allowed();
+ /* Ignore nodes not set in current->mems_allowed */
+ cpuset_restrict_to_mems_allowed(nodes.bits);
+
+ if (!mpol_check_policy(mode, nodes.bits))
+ return NULL;
+ return mpol_new(mode, nodes.bits);
+}
Index: linux-2.6.13-rc4-mm1/include/linux/mempolicy.h
===================================================================
--- linux-2.6.13-rc4-mm1.orig/include/linux/mempolicy.h 2005-08-01 12:59:45.000000000 -0700
+++ linux-2.6.13-rc4-mm1/include/linux/mempolicy.h 2005-08-01 13:00:01.000000000 -0700
@@ -157,6 +157,10 @@
extern void numa_policy_init(void);
extern struct mempolicy default_policy;
+/* Conversion functions */
+int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol);
+struct mempolicy *str_to_mpol(char *buffer);
+
#else
struct mempolicy {};
-
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