From: Joao Martins <joao.m.martins@oracle.com>
To: Jan Beulich <JBeulich@suse.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>,
Keir Fraser <keir@xen.org>,
xen-devel@lists.xen.org
Subject: Re: [PATCH v2 2/6] x86/time: refactor init_platform_time()
Date: Tue, 5 Apr 2016 11:55:20 +0100 [thread overview]
Message-ID: <57039998.5000202@oracle.com> (raw)
In-Reply-To: <5703AB0502000078000E31B7@prv-mh.provo.novell.com>
On 04/05/2016 11:09 AM, Jan Beulich wrote:
>>>> On 29.03.16 at 15:44, <joao.m.martins@oracle.com> wrote:
>> --- a/xen/arch/x86/time.c
>> +++ b/xen/arch/x86/time.c
>> @@ -533,6 +533,30 @@ static void resume_platform_timer(void)
>> plt_stamp = plt_src.read_counter();
>> }
>>
>> +static int __init try_platform_timer(struct platform_timesource *pts)
>> +{
>> + int rc = -1;
>
> Pointless initializer. In fact ...
>
>> + rc = pts->init(pts);
>
> ... this could be the initializer.
>
Ah yes. Will fix it.
>> + if ( rc <= 0 )
>> + return rc;
>> +
>> + plt_mask = (u64)~0ull >> (64 - pts->counter_bits);
>> +
>> + set_time_scale(&plt_scale, pts->frequency);
>> +
>> + plt_overflow_period = scale_delta(
>> + 1ull << (pts->counter_bits - 1), &plt_scale);
>> + init_timer(&plt_overflow_timer, plt_overflow, NULL, 0);
>> + plt_src = *pts;
>> + plt_overflow(NULL);
>> +
>> + platform_timer_stamp = plt_stamp64;
>> + stime_platform_stamp = NOW();
>> +
>> + return rc;
>> +}
>
> Moving here all this setting up of static/global data makes me
> wonder how you mean to consistently re-use this function for
> your new purpose.
My purpose is to reuse this initialization part for the case of switching from
from one clocksource to TSC at a later point (which is done in a different place
i.e. verify_tsc_reliability). Though this static/global data part in particular
is done if the clocksource initialization succeeds so I merged that in a single
helper hence the name "try_platform_timer". It also looks cleaner, and we would
leave opt_clocksource checking with plt_timers in init_platform_time.
Joao
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next prev parent reply other threads:[~2016-04-05 10:55 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-29 13:44 [PATCH v2 0/6] x86/time: PVCLOCK_TSC_STABLE_BIT support Joao Martins
2016-03-29 13:44 ` [PATCH v2 1/6] public/xen.h: add flags field to vcpu_time_info Joao Martins
2016-03-30 15:49 ` Ian Jackson
2016-03-30 16:33 ` Joao Martins
2016-03-31 7:09 ` Jan Beulich
2016-03-31 7:13 ` Jan Beulich
2016-03-31 11:04 ` Joao Martins
2016-04-05 10:16 ` Jan Beulich
2016-04-05 10:59 ` Joao Martins
2016-03-29 13:44 ` [PATCH v2 2/6] x86/time: refactor init_platform_time() Joao Martins
2016-04-01 16:10 ` Konrad Rzeszutek Wilk
2016-04-01 18:26 ` Joao Martins
2016-04-05 10:09 ` Jan Beulich
2016-04-05 10:55 ` Joao Martins [this message]
2016-04-05 11:16 ` Jan Beulich
2016-03-29 13:44 ` [PATCH v2 3/6] x86/time: implement tsc as clocksource Joao Martins
2016-03-29 17:39 ` Konrad Rzeszutek Wilk
2016-03-29 17:52 ` Joao Martins
2016-04-01 16:43 ` Konrad Rzeszutek Wilk
2016-04-01 18:38 ` Joao Martins
2016-04-01 18:45 ` Konrad Rzeszutek Wilk
2016-04-03 18:47 ` Joao Martins
2016-04-05 10:43 ` Jan Beulich
2016-04-05 14:56 ` Joao Martins
2016-04-05 15:12 ` Jan Beulich
2016-04-05 17:07 ` Joao Martins
2016-03-29 13:44 ` [PATCH v2 4/6] x86/time: streamline platform time init on plt_init() Joao Martins
2016-04-05 11:46 ` Jan Beulich
2016-04-05 15:12 ` Joao Martins
2016-04-05 15:22 ` Jan Beulich
2016-04-05 17:17 ` Joao Martins
2016-03-29 13:44 ` [PATCH v2 5/6] x86/time: refactor read_platform_stime() Joao Martins
2016-04-01 18:32 ` Konrad Rzeszutek Wilk
2016-04-05 11:52 ` Jan Beulich
2016-04-05 15:22 ` Joao Martins
2016-04-05 15:26 ` Jan Beulich
2016-04-05 17:08 ` Joao Martins
2016-03-29 13:44 ` [PATCH v2 6/6] x86/time: implement PVCLOCK_TSC_STABLE_BIT Joao Martins
2016-04-05 12:22 ` Jan Beulich
2016-04-05 21:34 ` Joao Martins
2016-04-07 15:58 ` Jan Beulich
2016-04-07 21:17 ` Joao Martins
2016-04-07 21:32 ` Jan Beulich
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