[lttng-dev] Add support for the LOONGARCH architecture

[Mathieu Desnoyers]

Hi,

I'm just checking if you have received my message ? I want to understand what is
going on here before merging your contribution into liburcu.

Thanks,

Mathieu

----- On Jan 25, 2022, at 4:36 PM, Mathieu Desnoyers mathieu.desnoyers at efficios.com wrote:

> Hi,
> 
> I notice that the loongarch enablement patch defines:
> 
> #define UATOMIC_HAS_ATOMIC_BYTE
> #define UATOMIC_HAS_ATOMIC_SHORT
> 
> I tried looking into
> 
>  https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html#atomic-memory-access-instructions
> 
> to figure out which atomic instructions or LL/SC would be used to target 1 and 2
> byte
> variables atomically, but could only find instructions for word and double-word:
> 
> 2.2.7.1. AM{SWAP/ADD/AND/OR/XOR/MAX/MIN}[DB].{W/D}, AM{MAX/MIN}[_DB].{WU/DU}
> 2.2.7.2. LL.{W/D}, SC.{W/D}
> 
> What am I missing here ?
> 
> Thanks,
> 
> Mathieu
> 
> ----- On Jan 24, 2022, at 6:59 AM, lttng-dev lttng-dev at lists.lttng.org wrote:
> 
>> Unfortunately, the qemu approach does not help much in testing that the
>> liburcu implementation works correctly on a given architecture's
>> specific memory model.
>> 
>> liburcu relies heavily on memory ordering, and liburcu-cds relies on
>> both memory ordering and atomic operations and the memory ordering
>> guarantees associated with them.
>> 
>> So if there is any way we could get our hands on real hardware, it
>> would be very much relevant for liburcu testing.
>> 
>> Thanks,
>> 
>> Mathieu
>> 
>> ----- On Jan 24, 2022, at 3:02 AM, 张文龙 zhangwenlong at loongson.cn wrote:
>> 
>>> I'm glad the new architecture can be accepted，At present, our machines are in
>>> short supply.I need to go through a very complicated process to provide
>>> machines, Can qemu emulator work?
>>> 
>>> 
>>> > -----原始邮件-----
>>> > 发件人: "Mathieu Desnoyers" <mathieu.desnoyers at efficios.com>
>>> > 发送时间: 2022-01-20 23:59:52 (星期四)
>>> > 收件人: "张文龙" <zhangwenlong at loongson.cn>
>>> > 抄送: lttng-dev <lttng-dev at lists.lttng.org>
>>> > 主题: Re: [lttng-dev] Add support for the LOONGARCH architecture
>>> >
>>> > ----- On Jan 19, 2022, at 11:03 PM, lttng-dev lttng-dev at lists.lttng.org
>>> wrote:
>>> >
>>> > > Hello, I'm excited to contribute to userspace-rcu, I added loongarch
>>> > > architecture for userspace-rcu（ The patch file is
>>> > > 0001-Add-support-for-the-LOONGARCH-architecture.patch )
>>> >
>>> > > I have compiled and verified locally (the build log is build_log.txt
>>> ),and then
>>> > > i runed make check（ the make check log is make_check_log.txt ）， make
>>> > > regtest（the make regtest log is make_regtest_log.txt ） ， make
>>> short_bench (the
>>> > > make short_bench log is make_short_bench_log.txt ),make long_bench(the
>>> make
>>> > > long_bench log is make_long_bench_log.txt )
>>> >
>>> > This is great, thanks !
>>> >
>>> > By the way, is there any way EfficiOS could add two loongarch test boards
>>> into
>>> > our test rack for automated CI testing ? See https://ci.lttng.org
>>> >
>>> > We typically deploy at least two boards for each given architecture for
>>> redundancy
>>> > and availability for both CI and development use.
>>> >
>>> > This would help ensuring we catch liburcu regressions in the loongarch
>>> architecture
>>> > in the future.
>>> >
>>> > Thanks,
>>> >
>>> > Mathieu
>>> >
>>> >
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>>> > --
>>> > Mathieu Desnoyers
>>> > EfficiOS Inc.
>>> > http://www.efficios.com
>>> </lttng-dev at lists.lttng.org></zhangwenlong at loongson.cn></mathieu.desnoyers at efficios.com>
>>> 
>>> 本邮件及其附件含有龙芯中科的商业秘密信息，仅限于发送给上面地址中列出的个人或群组。禁止任何其他人以任何形式使用（包括但不限于全部或部分地泄露、复制或散发）本邮件及其附件中的信息。如果您错收本邮件，请您立即电话或邮件通知发件人并删除本邮件。
>>> This email and its attachments contain confidential information from Loongson
>>> Technology , which is intended only for the person or entity whose address is
>>> listed above. Any use of the information contained herein in any way
>>> (including, but not limited to, total or partial disclosure, reproduction or
>>> dissemination) by persons other than the intended recipient(s) is prohibited.
>>> If you receive this email in error, please notify the sender by phone or email
>>> immediately and delete it.
>> 
>> --
>> Mathieu Desnoyers
>> EfficiOS Inc.
>> http://www.efficios.com
>> _______________________________________________
>> lttng-dev mailing list
>> lttng-dev at lists.lttng.org
>> https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
> 
> --
> Mathieu Desnoyers
> EfficiOS Inc.
> http://www.efficios.com

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com