On Thu, 19 Nov 2020 at 01:36, Tao Zhou <t1zhou@xxxxxxx> wrote: > > On Thu, Nov 19, 2020 at 07:50:15AM +0800, Tao Zhou wrote: > > On Wed, Nov 18, 2020 at 07:56:38PM -0300, Guilherme G. Piccoli wrote: > > > Hi Vincent (and all CCed), I'm sorry to ping about such "old" patch, but > > > we experienced a similar condition to what this patch addresses; it's an > > > older kernel (4.15.x) but when suggesting the users to move to an > > > updated 5.4.x kernel, we noticed that this patch is not there, although > > > similar ones are (like [0] and [1]). > > > > > > So, I'd like to ask if there's any particular reason to not backport > > > this fix to stable kernels, specially the longterm 5.4. The main reason > > > behind the question is that the code is very complex for non-experienced > > > scheduler developers, and I'm afraid in suggesting such backport to 5.4 > > > and introduce complex-to-debug issues. > > > > > > Let me know your thoughts Vincent (and all CCed), thanks in advance. > > > Cheers, > > > > > > > > > Guilherme > > > > > > > > > P.S. For those that deleted this thread from the email client, here's a > > > link: > > > https://lore.kernel.org/lkml/20200513135528.4742-1-vincent.guittot@xxxxxxxxxx/ > > > > > > > > > [0] > > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fe61468b2cb > > > > > > [1] > > > https://lore.kernel.org/lkml/20200506141821.GA9773@xxxxxxxxxxxxxxxxxxxxxxxxx/ > > > <- great thread BTW! > > > > 'sched/fair: Fix unthrottle_cfs_rq() for leaf_cfs_rq list" failed to apply to > > 5.4-stable tree' > > > > You could check above. But I do not have the link about this. Can't search it > > on LKML web: https://lore.kernel.org/lkml/ > > > > BTW: 'ouwen210@xxxxxxxxxxx' and 'zohooouoto@xxxxxxxxxxx' all is myself. > > > > Sorry for the confusing.. > > > > Thanks. > > Sorry again. I forget something. It is in the stable. > > Here it is: > > https://lore.kernel.org/stable/159041776924279@xxxxxxxxx/ I think it has never been applied to stable. As you mentioned, the backport has been sent : https://lore.kernel.org/stable/20200525172709.GB7427@vingu-book/ I received another emailed in September and pointed out to the backport : https://www.spinics.net/lists/stable/msg410445.html >
