linux-kernel - Re: [PREEMPT RT] SLUB and split softirq lock for v3.2-rt

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Message-ID: <517793BD.30101@linutronix.de>
Date:	Wed, 24 Apr 2013 10:11:41 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
	Carsten Emde <C.Emde@...dl.org>
Subject: Re: [PREEMPT RT] SLUB and split softirq lock for v3.2-rt

On 04/24/2013 04:36 AM, Steven Rostedt wrote:
> Hi Sebastian,

Hi Steven,

> Which version of 3.2-rt was this applied to. It does not apply, where
> patch 7/16 totally does not apply. I looked at the history of 3.2-rt and
> I can't find where it would apply.

I applied them on top of 2438ee33 ("Linux 3.2.37-rt55 REBASE"). I just
grabbed the patches from the mailing list and re-applied them on top of
this tree and is still works.

After doing the same thing on v3.2.43-rt63-rebase I got:

Applying: softirq: Make serving softirqs a task flag
Applying: softirq: Split handling function
Applying: softirq: Split softirq locks
Using index info to reconstruct a base tree...
Falling back to patching base and 3-way merge...
Auto-merging include/linux/sched.h
Applying: rcu: rcutiny: Prevent RCU stall
Applying: softirq: Adapt NOHZ softirq pending check to new RT scheme
Applying: softirq: Add more debugging
Applying: softirq: Fix nohz pending issue for real
Applying: net: Use local_bh_disable in netif_rx_ni()
Applying: FIX [1/2] slub: Do not dereference NULL pointer in node_match
Applying: FIX [2/2] slub: Tid must be retrieved from the percpu area of
the current processor
Applying: slub: Use correct cpu_slab on dead cpu
Applying: smp: introduce a generic on_each_cpu_mask() function
Applying: smp: add func to IPI cpus based on parameter func
Applying: slub: only IPI CPUs that have per cpu obj to flush
Applying: mm: Enable SLUB for RT
Applying: slub: Enable irqs for __GFP_WAIT

git did not complain about patch 7 ("softirq: Fix nohz pending issue for
real") but about 3 ("softirq: Split softirq locks"). The diff between
the two queues (except different sha1, index and so) is:

--- old/0003-softirq-Split-softirq-locks.patch
+++ new/0003-softirq-Split-softirq-locks.patch
@@ -60,8 +60,8 @@
        int softirq_nestcnt;
 +      unsigned int softirqs_raised;
  #endif
- #if defined CONFIG_PREEMPT_RT_FULL && defined CONFIG_HIGHMEM
-       int kmap_idx;
+ #ifdef CONFIG_PREEMPT_RT_FULL
+ # if defined CONFIG_HIGHMEM || defined CONFIG_X86_32

and this looks good.

> Thanks,
> 
> -- Steve

Sebastian
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