This allow us to print out raw counter value. The /proc/pid/fdinfo/fd output is
| pos: 0 | flags: 04002 | eventfd-count: 5a Signed-off-by: Cyrill Gorcunov <[email protected]> CC: Pavel Emelyanov <[email protected]> CC: Al Viro <[email protected]> CC: Alexey Dobriyan <[email protected]> CC: Andrew Morton <[email protected]> CC: James Bottomley <[email protected]> --- fs/eventfd.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) Index: linux-2.6.git/fs/eventfd.c =================================================================== --- linux-2.6.git.orig/fs/eventfd.c +++ linux-2.6.git/fs/eventfd.c @@ -19,6 +19,8 @@ #include <linux/export.h> #include <linux/kref.h> #include <linux/eventfd.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> struct eventfd_ctx { struct kref kref; @@ -284,7 +286,25 @@ static ssize_t eventfd_write(struct file return res; } +#ifdef CONFIG_PROC_FS +static int eventfd_show_fdinfo(struct seq_file *m, struct file *f) +{ + struct eventfd_ctx *ctx = f->private_data; + int ret; + + spin_lock_irq(&ctx->wqh.lock); + ret = seq_printf(m, "eventfd-count: %16llx\n", + (unsigned long long)ctx->count); + spin_unlock_irq(&ctx->wqh.lock); + + return ret; +} +#endif + static const struct file_operations eventfd_fops = { +#ifdef CONFIG_PROC_FS + .show_fdinfo = eventfd_show_fdinfo, +#endif .release = eventfd_release, .poll = eventfd_poll, .read = eventfd_read, -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
