c - task_pid_nr(current) returns a pid that doesn't appear in the output of ps -

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within linux kernel (4.5.5), have added printk() mm/filemap.c.

the code have added inside of __generic_file_write_iter():

if(io_tracing_on) {         ssize_t write_size = iov_length(from->iov, from->nr_segs);         printk(kern_info "write size=%zu, pid=%d, inode=%lu\n", write_size, task_pid_nr(current), inode->i_ino); }

when io_tracing_on evaluates true, continuous stream of output (discussed in different question) follows:

jun 27 15:00:41 malka kernel: [  463.424155] write size=168, pid=715, inode=7864653 jun 27 15:00:41 malka kernel: [  463.428064] write size=168, pid=715, inode=7864354

during continuous stream of output, have tried map pid (715) output of ps -ef, no avail -- pid not exist in process list. there way me determine process task_pid_nr(current) referring to?

the pid in kernel have little bit different meaning, should use tgid match pid userspace perspective


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