[lkml]   [2019]   [Sep]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: printk meeting at LPC
On 2019/09/13 22:26, John Ogness wrote:
> 6. A new may-sleep function pr_flush() will be made available to wait
> for all previously printk'd messages to be output on all consoles before
> proceeding. For example:
> pr_cont("Running test ABC... ");
> pr_flush();
> do_test();
> pr_cont("PASSED\n");
> pr_flush();

Don't we need to allow printk() callers to know the sequence number which
the printk() has queued? Something like

u64 seq;
seq = pr_current_seq();

in case concurrently executed printk() flooding keeps adding a lot of
pending output?

By the way, do we need to keep printk() return bytes like printf() ?
Maybe we can make printk() return "void", for almost nobody can do
meaningful things with the return value.

> 9. Support for printk dictionaries will be discontinued. I will look
> into who is using this and why. If printk dictionaries are important for
> you, speak up now!

I think that dev_printk() is using "const char *dict, size_t dictlen," part
via create_syslog_header(). Some userspace programs might depend on
availability of such information.

 \ /
  Last update: 2019-09-16 06:30    [W:0.143 / U:7.816 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site