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perf_counter: Generate mmap events for install_special_mapping()

Browse source 
In order to track the vdso also generate mmap events for
install_special_mapping().

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-06-05 14:04:55 +02:00 committed by Ingo Molnar
parent f7b6eb3fa0
commit 089dd79db9
3 changed files with 33 additions and 20 deletions
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14
include/linux/perf_counter.h
View file

@ -617,8 +617,13 @@ static inline int is_software_counter(struct perf_counter *counter)
extern void perf_swcounter_event(u32, u64, int, struct pt_regs *, u64);
extern void perf_counter_mmap(unsigned long addr, unsigned long len,
unsigned long pgoff, struct file *file);
extern void __perf_counter_mmap(struct vm_area_struct *vma);
static inline void perf_counter_mmap(struct vm_area_struct *vma)
{
if (vma->vm_flags & VM_EXEC)
__perf_counter_mmap(vma);
}
extern void perf_counter_comm(struct task_struct *tsk);
extern void perf_counter_fork(struct task_struct *tsk);
@ -668,10 +673,7 @@ static inline void
perf_swcounter_event(u32 event, u64 nr, int nmi,
struct pt_regs *regs, u64 addr) { }
static inline void
perf_counter_mmap(unsigned long addr, unsigned long len,
unsigned long pgoff, struct file *file) { }
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) { }

34
kernel/perf_counter.c
View file

@ -2255,7 +2255,7 @@ out:
}
static void perf_output_copy(struct perf_output_handle *handle,
void *buf, unsigned int len)
const void *buf, unsigned int len)
{
unsigned int pages_mask;
unsigned int offset;
@ -2681,9 +2681,10 @@ void perf_counter_comm(struct task_struct *task)
*/
struct perf_mmap_event {
struct file *file;
char *file_name;
int file_size;
struct vm_area_struct *vma;
const char *file_name;
int file_size;
struct {
struct perf_event_header header;
@ -2744,11 +2745,12 @@ static void perf_counter_mmap_event(struct perf_mmap_event *mmap_event)
{
struct perf_cpu_context *cpuctx;
struct perf_counter_context *ctx;
struct file *file = mmap_event->file;
struct vm_area_struct *vma = mmap_event->vma;
struct file *file = vma->vm_file;
unsigned int size;
char tmp[16];
char *buf = NULL;
char *name;
const char *name;
if (file) {
buf = kzalloc(PATH_MAX, GFP_KERNEL);
@ -2762,6 +2764,15 @@ static void perf_counter_mmap_event(struct perf_mmap_event *mmap_event)
goto got_name;
}
} else {
name = arch_vma_name(mmap_event->vma);
if (name)
goto got_name;
if (!vma->vm_mm) {
name = strncpy(tmp, "[vdso]", sizeof(tmp));
goto got_name;
}
name = strncpy(tmp, "//anon", sizeof(tmp));
goto got_name;
}
@ -2791,8 +2802,7 @@ got_name:
kfree(buf);
}
void perf_counter_mmap(unsigned long addr, unsigned long len,
unsigned long pgoff, struct file *file)
void __perf_counter_mmap(struct vm_area_struct *vma)
{
struct perf_mmap_event mmap_event;
@ -2800,12 +2810,12 @@ void perf_counter_mmap(unsigned long addr, unsigned long len,
return;
mmap_event = (struct perf_mmap_event){
.file = file,
.vma = vma,
.event = {
.header = { .type = PERF_EVENT_MMAP, },
.start = addr,
.len = len,
.pgoff = pgoff,
.start = vma->vm_start,
.len = vma->vm_end - vma->vm_start,
.pgoff = vma->vm_pgoff,
},
};

5
mm/mmap.c
View file

@ -1220,8 +1220,7 @@ munmap_back:
if (correct_wcount)
atomic_inc(&inode->i_writecount);
out:
if (vm_flags & VM_EXEC)
perf_counter_mmap(addr, len, pgoff, file);
perf_counter_mmap(vma);
mm->total_vm += len >> PAGE_SHIFT;
vm_stat_account(mm, vm_flags, file, len >> PAGE_SHIFT);
@ -2309,6 +2308,8 @@ int install_special_mapping(struct mm_struct *mm,
mm->total_vm += len >> PAGE_SHIFT;
perf_counter_mmap(vma);
return 0;
}