-#ifndef _LTTNG_WRAPPER_VMALLOC_H
-#define _LTTNG_WRAPPER_VMALLOC_H
-
-/*
+/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
+ *
* wrapper/vmalloc.h
*
* wrapper around vmalloc_sync_all. Using KALLSYMS to get its address when
* modules.
*
* Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; only
- * version 2.1 of the License.
- *
- * This library 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 GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#ifndef _LTTNG_WRAPPER_VMALLOC_H
+#define _LTTNG_WRAPPER_VMALLOC_H
+
#include <linux/version.h>
#include <linux/vmalloc.h>
+#include <linux/mm.h>
#ifdef CONFIG_KALLSYMS
#include <linux/kallsyms.h>
#include <wrapper/kallsyms.h>
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,7,0))
+
+static inline
+void wrapper_vmalloc_sync_mappings(void)
+{
+ void (*vmalloc_sync_mappings_sym)(void);
+
+ vmalloc_sync_mappings_sym = (void *) kallsyms_lookup_funcptr("vmalloc_sync_mappings");
+ if (vmalloc_sync_mappings_sym) {
+ vmalloc_sync_mappings_sym();
+ } else {
+#ifdef CONFIG_X86
+ /*
+ * Only x86 needs vmalloc_sync_mappings to make sure LTTng does not
+ * trigger recursive page faults.
+ */
+ printk_once(KERN_WARNING "LTTng: vmalloc_sync_mappings symbol lookup failed.\n");
+ printk_once(KERN_WARNING "Page fault handler and NMI tracing might trigger faults.\n");
+#endif
+ }
+}
+
+#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,7,0)) */
+
+/*
+ * Map vmalloc_sync_mappings to vmalloc_sync_all() on kernels before 5.7.
+ */
static inline
-void wrapper_vmalloc_sync_all(void)
+void wrapper_vmalloc_sync_mappings(void)
{
void (*vmalloc_sync_all_sym)(void);
#endif
}
}
+
+#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,7,0)) */
+
#else
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,7,0))
+
+static inline
+void wrapper_vmalloc_sync_mappings(void)
+{
+ return vmalloc_sync_mappings();
+}
+
+#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,7,0)) */
+
static inline
-void wrapper_vmalloc_sync_all(void)
+void wrapper_vmalloc_sync_mappings(void)
{
return vmalloc_sync_all();
}
+
+#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,7,0)) */
+
#endif
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,12,0))
* Make sure we don't trigger recursive page faults in the
* tracing fast path.
*/
- wrapper_vmalloc_sync_all();
+ wrapper_vmalloc_sync_mappings();
}
return ret;
}
#else
#include <linux/slab.h>
-#include <linux/mm.h>
+
+static inline
+void print_vmalloc_node_range_warning(void)
+{
+ printk_once(KERN_WARNING "LTTng: __vmalloc_node_range symbol lookup failed.\n");
+ printk_once(KERN_WARNING "Tracer performance will be degraded on NUMA systems.\n");
+ printk_once(KERN_WARNING "Please rebuild your kernel with CONFIG_KALLSYMS enabled.\n");
+}
/*
* kallsyms wrapper of __vmalloc_node with a fallback to kmalloc_node.
*/
static inline
-void *__lttng_vmalloc_node_fallback(unsigned long size, unsigned long align,
- gfp_t gfp_mask, pgprot_t prot, int node, void *caller)
+void *__lttng_vmalloc_node_range(unsigned long size, unsigned long align,
+ unsigned long start, unsigned long end, gfp_t gfp_mask,
+ pgprot_t prot, unsigned long vm_flags, int node,
+ const void *caller)
{
- void *ret;
-
#ifdef CONFIG_KALLSYMS
/*
- * If we have KALLSYMS, get * __vmalloc_node which is not exported.
+ * If we have KALLSYMS, get * __vmalloc_node_range which is not exported.
*/
- void *(*lttng__vmalloc_node)(unsigned long size, unsigned long align,
- gfp_t gfp_mask, pgprot_t prot, int node, void *caller);
-
- lttng__vmalloc_node = (void *) kallsyms_lookup_funcptr("__vmalloc_node");
- ret = lttng__vmalloc_node(size, align, gfp_mask, prot, node, caller);
-#else
- /*
- * If we don't have KALLSYMS, fallback to kmalloc_node.
- */
- ret = kmalloc_node(size, flags, node);
+ void *(*lttng__vmalloc_node_range)(unsigned long size, unsigned long align,
+ unsigned long start, unsigned long end, gfp_t gfp_mask,
+ pgprot_t prot, unsigned long vm_flags, int node,
+ const void *caller);
+
+ lttng__vmalloc_node_range = (void *) kallsyms_lookup_funcptr("__vmalloc_node_range");
+ if (lttng__vmalloc_node_range)
+ return lttng__vmalloc_node_range(size, align, start, end, gfp_mask, prot,
+ vm_flags, node, caller);
#endif
-
- return ret;
+ if (node != NUMA_NO_NODE)
+ print_vmalloc_node_range_warning();
+ return __vmalloc(size, gfp_mask, prot);
}
/**
*/
ret = kmalloc_node(size, flags | __GFP_NOWARN | __GFP_NORETRY, node);
if (!ret) {
- if (node == NUMA_NO_NODE) {
- /*
- * If no node was specified, use __vmalloc which is
- * always exported.
- */
- ret = __vmalloc(size, flags | __GFP_HIGHMEM, PAGE_KERNEL);
- } else {
- /*
- * Otherwise, we need to select a node but __vmalloc_node
- * is not exported, use this fallback wrapper which uses
- * kallsyms if available or falls back to kmalloc_node.
- */
- ret = __lttng_vmalloc_node_fallback(size, 1,
- flags | __GFP_HIGHMEM, PAGE_KERNEL, node,
- __builtin_return_address(0));
- }
-
+ ret = __lttng_vmalloc_node_range(size, 1,
+ VMALLOC_START, VMALLOC_END,
+ flags | __GFP_HIGHMEM, PAGE_KERNEL, 0,
+ node, __builtin_return_address(0));
/*
* Make sure we don't trigger recursive page faults in the
* tracing fast path.
projects / lttng-modules.git / blobdiff