* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#include <linux/version.h>
+#include <linux/vmalloc.h>
+#include <linux/mm.h>
+
#ifdef CONFIG_KALLSYMS
#include <linux/kallsyms.h>
-#include "kallsyms.h"
+#include <wrapper/kallsyms.h>
static inline
void wrapper_vmalloc_sync_all(void)
* Only x86 needs vmalloc_sync_all to make sure LTTng does not
* trigger recursive page faults.
*/
- printk(KERN_WARNING "LTTng: vmalloc_sync_all symbol lookup failed.\n");
- printk(KERN_WARNING "Page fault handler and NMI tracing might trigger faults.\n");
+ printk_once(KERN_WARNING "LTTng: vmalloc_sync_all symbol lookup failed.\n");
+ printk_once(KERN_WARNING "Page fault handler and NMI tracing might trigger faults.\n");
#endif
}
}
#else
-#include <linux/vmalloc.h>
-
static inline
void wrapper_vmalloc_sync_all(void)
{
}
#endif
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,12,0))
+static inline
+void *lttng_kvmalloc_node(unsigned long size, gfp_t flags, int node)
+{
+ void *ret;
+
+ ret = kvmalloc_node(size, flags, node);
+ if (is_vmalloc_addr(ret)) {
+ /*
+ * Make sure we don't trigger recursive page faults in the
+ * tracing fast path.
+ */
+ wrapper_vmalloc_sync_all();
+ }
+ return ret;
+}
+
+static inline
+void *lttng_kvzalloc_node(unsigned long size, gfp_t flags, int node)
+{
+ return lttng_kvmalloc_node(size, flags | __GFP_ZERO, node);
+}
+
+static inline
+void *lttng_kvmalloc(unsigned long size, gfp_t flags)
+{
+ return lttng_kvmalloc_node(size, flags, NUMA_NO_NODE);
+}
+
+static inline
+void *lttng_kvzalloc(unsigned long size, gfp_t flags)
+{
+ return lttng_kvzalloc_node(size, flags, NUMA_NO_NODE);
+}
+
+static inline
+void lttng_kvfree(const void *addr)
+{
+ kvfree(addr);
+}
+
+#else
+
+#include <linux/slab.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_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)
+{
+#ifdef CONFIG_KALLSYMS
+ /*
+ * If we have KALLSYMS, get * __vmalloc_node_range which is not exported.
+ */
+ 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
+ if (node != NUMA_NO_NODE)
+ print_vmalloc_node_range_warning();
+ return __vmalloc(size, gfp_mask, prot);
+}
+
+/**
+ * lttng_kvmalloc_node - attempt to allocate physically contiguous memory, but upon
+ * failure, fall back to non-contiguous (vmalloc) allocation.
+ * @size: size of the request.
+ * @flags: gfp mask for the allocation - must be compatible with GFP_KERNEL.
+ *
+ * Uses kmalloc to get the memory but if the allocation fails then falls back
+ * to the vmalloc allocator. Use lttng_kvfree to free the memory.
+ *
+ * Reclaim modifiers - __GFP_NORETRY, __GFP_REPEAT and __GFP_NOFAIL are not supported
+ */
+static inline
+void *lttng_kvmalloc_node(unsigned long size, gfp_t flags, int node)
+{
+ void *ret;
+
+ /*
+ * vmalloc uses GFP_KERNEL for some internal allocations (e.g page tables)
+ * so the given set of flags has to be compatible.
+ */
+ WARN_ON_ONCE((flags & GFP_KERNEL) != GFP_KERNEL);
+
+ /*
+ * If the allocation fits in a single page, do not fallback.
+ */
+ if (size <= PAGE_SIZE) {
+ return kmalloc_node(size, flags, node);
+ }
+
+ /*
+ * Make sure that larger requests are not too disruptive - no OOM
+ * killer and no allocation failure warnings as we have a fallback
+ */
+ ret = kmalloc_node(size, flags | __GFP_NOWARN | __GFP_NORETRY, node);
+ if (!ret) {
+ 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.
+ */
+ wrapper_vmalloc_sync_all();
+ }
+ return ret;
+}
+
+static inline
+void *lttng_kvzalloc_node(unsigned long size, gfp_t flags, int node)
+{
+ return lttng_kvmalloc_node(size, flags | __GFP_ZERO, node);
+}
+
+static inline
+void *lttng_kvmalloc(unsigned long size, gfp_t flags)
+{
+ return lttng_kvmalloc_node(size, flags, NUMA_NO_NODE);
+}
+
+static inline
+void *lttng_kvzalloc(unsigned long size, gfp_t flags)
+{
+ return lttng_kvzalloc_node(size, flags, NUMA_NO_NODE);
+}
+
+static inline
+void lttng_kvfree(const void *addr)
+{
+ if (is_vmalloc_addr(addr)) {
+ vfree(addr);
+ } else {
+ kfree(addr);
+ }
+}
+#endif
+
#endif /* _LTTNG_WRAPPER_VMALLOC_H */
projects / lttng-modules.git / blobdiff