Large applications(e.g. Cassandra) may have hundreds of threads
running. To trace all those threads, larger size(>PAGE_SIZE) of
filter pattern is needed.
Signed-off-by: Zi Yan <zi....@cs.rutgers.edu>
---
kernel/trace/trace_events.c | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index db54dda..8347c48 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -1092,15 +1092,12 @@ event_filter_write(struct file *filp, const char __user
*ubuf, size_t cnt,
char *buf;
int err = -ENODEV;
- if (cnt >= PAGE_SIZE)
- return -EINVAL;
-
- buf = (char *)__get_free_page(GFP_TEMPORARY);
+ buf = (char *)alloc_pages_exact(cnt, GFP_TEMPORARY);
if (!buf)
return -ENOMEM;
if (copy_from_user(buf, ubuf, cnt)) {
- free_page((unsigned long) buf);
+ free_pages_exact((unsigned long) buf, cnt);
return -EFAULT;
}
buf[cnt] = '\0';
@@ -1111,7 +1108,7 @@ event_filter_write(struct file *filp, const char __user
*ubuf, size_t cnt,
err = apply_event_filter(file, buf);
mutex_unlock(&event_mutex);
- free_page((unsigned long) buf);
+ free_pages_exact((unsigned long) buf, cnt);
if (err < 0)
return err;
--
2.1.4
--
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