From: Wen Yang <wenyang.linux@xxxxxxxxxxx>
When printing eventfd->count, interrupts will be disabled and a spinlock
will be obtained, competing with eventfd_write(). By moving the
"eventfd-count" print out of the spinlock and merging multiple
seq_printf() into one, it could improve a bit, just like timerfd_show().
Signed-off-by: Wen Yang <wenyang.linux@xxxxxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: Christian Brauner <brauner@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Dylan Yudaken <dylany@xxxxxx>
Cc: David Woodhouse <dwmw@xxxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Eric Biggers <ebiggers@xxxxxxxxxx>
Cc: linux-fsdevel@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
fs/eventfd.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/fs/eventfd.c b/fs/eventfd.c
index ad8186d47ba7..a6fa6ee748df 100644
--- a/fs/eventfd.c
+++ b/fs/eventfd.c
@@ -283,13 +283,18 @@ static ssize_t eventfd_write(struct file *file, const char __user *buf, size_t c
static void eventfd_show_fdinfo(struct seq_file *m, struct file *f)
{
struct eventfd_ctx *ctx = f->private_data;
+ unsigned long long cnt;
spin_lock_irq(&ctx->wqh.lock);
- seq_printf(m, "eventfd-count: %16llx\n",
- (unsigned long long)ctx->count);
+ cnt = ctx->count;
spin_unlock_irq(&ctx->wqh.lock);
- seq_printf(m, "eventfd-id: %d\n", ctx->id);
- seq_printf(m, "eventfd-semaphore: %d\n",
+
+ seq_printf(m,
+ "eventfd-count: %16llx\n"
+ "eventfd-id: %d\n"
+ "eventfd-semaphore: %d\n",
+ cnt,
+ ctx->id,
!!(ctx->flags & EFD_SEMAPHORE));
}
#endif
--
2.25.1
