Merge branch 'perfcounters-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'perfcounters-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (49 commits)
  perfcounter: Handle some IO return values
  perf_counter: Push perf_sample_data through the swcounter code
  perf_counter tools: Define and use our own u64, s64 etc. definitions
  perf_counter: Close race in perf_lock_task_context()
  perf_counter, x86: Improve interactions with fast-gup
  perf_counter: Simplify and fix task migration counting
  perf_counter tools: Add a data file header
  perf_counter: Update userspace callchain sampling uses
  perf_counter: Make callchain samples extensible
  perf report: Filter to parent set by default
  perf_counter tools: Handle lost events
  perf_counter: Add event overlow handling
  fs: Provide empty .set_page_dirty() aop for anon inodes
  perf_counter: tools: Makefile tweaks for 64-bit powerpc
  perf_counter: powerpc: Add processor back-end for MPC7450 family
  perf_counter: powerpc: Make powerpc perf_counter code safe for 32-bit kernels
  perf_counter: powerpc: Change how processor-specific back-ends get selected
  perf_counter: powerpc: Use unsigned long for register and constraint values
  perf_counter: powerpc: Enable use of software counters on 32-bit powerpc
  perf_counter tools: Add and use isprint()
  ...

2 files changed, 55 insertions, 30 deletions

diff --git a/include/linux/mm.h b/include/linux/mm.h
index d88d6fc530ad..cf260d848eb9 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -854,6 +854,12 @@ extern int mprotect_fixup(struct vm_area_struct *vma,
                           unsigned long end, unsigned long newflags);
 
 /*
+ * doesn't attempt to fault and will return short.
+ */
+int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
+                          struct page **pages);
+
+/*
  * A callback you can register to apply pressure to ageable caches.
  *
  * 'shrink' is passed a count 'nr_to_scan' and a 'gfpmask'.  It should
diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index 1b3118a1023a..89698d8aba5c 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -236,10 +236,16 @@ struct perf_counter_mmap_page {
         /*
          * Control data for the mmap() data buffer.
          *
-         * User-space reading this value should issue an rmb(), on SMP capable
-         * platforms, after reading this value -- see perf_counter_wakeup().
+         * User-space reading the @data_head value should issue an rmb(), on
+         * SMP capable platforms, after reading this value -- see
+         * perf_counter_wakeup().
+         *
+         * When the mapping is PROT_WRITE the @data_tail value should be
+         * written by userspace to reflect the last read data. In this case
+         * the kernel will not over-write unread data.
          */
         __u64   data_head;              /* head in the data section */
+        __u64   data_tail;              /* user-space written tail */
 };
 
 #define PERF_EVENT_MISC_CPUMODE_MASK            (3 << 0)
@@ -275,6 +281,15 @@ enum perf_event_type {
 
         /*
          * struct {
+         *      struct perf_event_header        header;
+         *      u64                             id;
+         *      u64                             lost;
+         * };
+         */
+        PERF_EVENT_LOST                 = 2,
+
+        /*
+         * struct {
          *      struct perf_event_header        header;
          *
          *      u32                             pid, tid;
@@ -313,30 +328,39 @@ enum perf_event_type {
 
         /*
          * When header.misc & PERF_EVENT_MISC_OVERFLOW the event_type field
-         * will be PERF_RECORD_*
+         * will be PERF_SAMPLE_*
          *
          * struct {
          *      struct perf_event_header        header;
          *
-         *      { u64                   ip;       } && PERF_RECORD_IP
-         *      { u32                   pid, tid; } && PERF_RECORD_TID
-         *      { u64                   time;     } && PERF_RECORD_TIME
-         *      { u64                   addr;     } && PERF_RECORD_ADDR
-         *      { u64                   config;   } && PERF_RECORD_CONFIG
-         *      { u32                   cpu, res; } && PERF_RECORD_CPU
+         *      { u64                   ip;       } && PERF_SAMPLE_IP
+         *      { u32                   pid, tid; } && PERF_SAMPLE_TID
+         *      { u64                   time;     } && PERF_SAMPLE_TIME
+         *      { u64                   addr;     } && PERF_SAMPLE_ADDR
+         *      { u64                   config;   } && PERF_SAMPLE_CONFIG
+         *      { u32                   cpu, res; } && PERF_SAMPLE_CPU
          *
          *      { u64                   nr;
-         *        { u64 id, val; }      cnt[nr];  } && PERF_RECORD_GROUP
+         *        { u64 id, val; }      cnt[nr];  } && PERF_SAMPLE_GROUP
          *
-         *      { u16                   nr,
-         *                              hv,
-         *                              kernel,
-         *                              user;
-         *        u64                   ips[nr];  } && PERF_RECORD_CALLCHAIN
+         *      { u64                   nr,
+         *        u64                   ips[nr];  } && PERF_SAMPLE_CALLCHAIN
          * };
          */
 };
 
+enum perf_callchain_context {
+        PERF_CONTEXT_HV                 = (__u64)-32,
+        PERF_CONTEXT_KERNEL             = (__u64)-128,
+        PERF_CONTEXT_USER               = (__u64)-512,
+
+        PERF_CONTEXT_GUEST              = (__u64)-2048,
+        PERF_CONTEXT_GUEST_KERNEL       = (__u64)-2176,
+        PERF_CONTEXT_GUEST_USER         = (__u64)-2560,
+
+        PERF_CONTEXT_MAX                = (__u64)-4095,
+};
+
 #ifdef __KERNEL__
 /*
  * Kernel-internal data types and definitions:
@@ -356,6 +380,13 @@ enum perf_event_type {
 #include <linux/pid_namespace.h>
 #include <asm/atomic.h>
 
+#define PERF_MAX_STACK_DEPTH            255
+
+struct perf_callchain_entry {
+        __u64                           nr;
+        __u64                           ip[PERF_MAX_STACK_DEPTH];
+};
+
 struct task_struct;
 
 /**
@@ -414,6 +445,7 @@ struct file;
 struct perf_mmap_data {
         struct rcu_head                 rcu_head;
         int                             nr_pages;       /* nr of data pages  */
+        int                             writable;       /* are we writable   */
         int                             nr_locked;      /* nr pages mlocked  */
 
         atomic_t                        poll;           /* POLL_ for wakeups */
@@ -423,8 +455,8 @@ struct perf_mmap_data {
         atomic_long_t                   done_head;      /* completed head    */
 
         atomic_t                        lock;           /* concurrent writes */
-
         atomic_t                        wakeup;         /* needs a wakeup    */
+        atomic_t                        lost;           /* nr records lost   */
 
         struct perf_counter_mmap_page   *user_page;
         void                            *data_pages[0];
@@ -604,6 +636,7 @@ extern void perf_counter_task_tick(struct task_struct *task, int cpu);
 extern int perf_counter_init_task(struct task_struct *child);
 extern void perf_counter_exit_task(struct task_struct *child);
 extern void perf_counter_free_task(struct task_struct *task);
+extern void set_perf_counter_pending(void);
 extern void perf_counter_do_pending(void);
 extern void perf_counter_print_debug(void);
 extern void __perf_disable(void);
@@ -649,18 +682,6 @@ static inline void perf_counter_mmap(struct vm_area_struct *vma)
 extern void perf_counter_comm(struct task_struct *tsk);
 extern void perf_counter_fork(struct task_struct *tsk);
 
-extern void perf_counter_task_migration(struct task_struct *task, int cpu);
-
-#define MAX_STACK_DEPTH                 255
-
-struct perf_callchain_entry {
-        u16                             nr;
-        u16                             hv;
-        u16                             kernel;
-        u16                             user;
-        u64                             ip[MAX_STACK_DEPTH];
-};
-
 extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs);
 
 extern int sysctl_perf_counter_paranoid;
@@ -701,8 +722,6 @@ static inline void perf_counter_mmap(struct vm_area_struct *vma)	{ }
 static inline void perf_counter_comm(struct task_struct *tsk)           { }
 static inline void perf_counter_fork(struct task_struct *tsk)           { }
 static inline void perf_counter_init(void)                              { }
-static inline void perf_counter_task_migration(struct task_struct *task,
-                                               int cpu)                 { }
 #endif
 
 #endif /* __KERNEL__ */