On Thu, Dec 13, 2018 at 10:59:31AM +0100, Petr Mladek wrote:
On Wed 2018-12-12 18:39:42, Daniel Wang wrote:
Additionally, for dbdda842fe96f to work as expected we really
need fd5f7cde1b85d4c. Otherwise printk() can schedule under console_sem and console_owner, which will deactivate the "load balance" logic.
It looks like fd5f7cde1b85d4c got into 4.14.82 that was released last month.
On Wed, Dec 12, 2018 at 6:27 PM Sergey Senozhatsky sergey.senozhatsky.work@gmail.com wrote:
On (12/12/18 16:40), Daniel Wang wrote:
In case this was buried in previous messages, the commit I'd like to get backported to 4.14 is dbdda842fe96f: printk: Add console owner and waiter logic to load balance console writes. But another followup patch that fixes a bug in that patch is also required. That is c14376de3a1b: printk: Wake klogd when passing console_lock owner.
Additionally, for dbdda842fe96f to work as expected we really need fd5f7cde1b85d4c. Otherwise printk() can schedule under console_sem and console_owner, which will deactivate the "load balance" logic.
To make it clear. Please, make sure that the following commits are backported together:
- dbdda842fe96f8932ba ("printk: Add console owner and waiter logic to load balance console writes")
- c162d5b4338d72deed6 ("printk: Hide console waiter logic into helpers")
- fd5f7cde1b85d4c8e09 ("printk: Never set console_may_schedule in console_trylock()")
- c14376de3a1befa70d9 ("printk: Wake klogd when passing console_lock owner")
I generated this list from git log using "Fixes:" tag. It seems to mention all commits dicussed above.
All 4 queued for 4.14, thank you.
-- Thanks, Sasha