From: SF Markus Elfring <elfring@users.sourceforge.net>
To: Steven Rostedt <rostedt@goodmis.org>, kernel-janitors@vger.kernel.org
Cc: linux-kselftest@vger.kernel.org, linux-nfs@vger.kernel.org,
linux-kernel@vger.kernel.org,
Peter Zijlstra <peterz@infradead.org>,
Trond Myklebust <trondmy@primarydata.com>
Subject: Re: Difficulties for compilation without extra optimisation
Date: Sun, 3 Dec 2017 22:56:51 +0100 [thread overview]
Message-ID: <bd57d7d5-c8f5-0bc9-c96f-37550557dca3@users.sourceforge.net> (raw)
In-Reply-To: <20171203162256.4ea0750d@vmware.local.home>
> Why would you compile the kernel without optimization?
I would like to see how big an effect finally is in such a build configuration
after specific source code adjustments.
> There's many places in the kernel that WILL NOT BUILD without optimization.
I did not really know this detail so far.
I noticed that the optimised build variants worked during my test comparisons.
> In fact, we do a lot of tricks to make sure that things work the way
> we expect it to, because we add broken code that only gets compiled out
> when gcc optimizes the code the way we expect it to be,
> and the kernel build will break otherwise.
Thanks for your information.
Can the software areas distinguished where such special handling matters?
Regards,
Markus
WARNING: multiple messages have this Message-ID (diff)
From: SF Markus Elfring <elfring@users.sourceforge.net>
To: kernel-janitors@vger.kernel.org
Subject: Re: Difficulties for compilation without extra optimisation
Date: Sun, 03 Dec 2017 21:56:51 +0000 [thread overview]
Message-ID: <bd57d7d5-c8f5-0bc9-c96f-37550557dca3@users.sourceforge.net> (raw)
In-Reply-To: <20171203162256.4ea0750d@vmware.local.home>
> Why would you compile the kernel without optimization?
I would like to see how big an effect finally is in such a build configuration
after specific source code adjustments.
> There's many places in the kernel that WILL NOT BUILD without optimization.
I did not really know this detail so far.
I noticed that the optimised build variants worked during my test comparisons.
> In fact, we do a lot of tricks to make sure that things work the way
> we expect it to, because we add broken code that only gets compiled out
> when gcc optimizes the code the way we expect it to be,
> and the kernel build will break otherwise.
Thanks for your information.
Can the software areas distinguished where such special handling matters?
Regards,
Markus
WARNING: multiple messages have this Message-ID (diff)
From: elfring at users.sourceforge.net (SF Markus Elfring)
Subject: [Linux-kselftest-mirror] Difficulties for compilation without extra optimisation
Date: Sun, 3 Dec 2017 22:56:51 +0100 [thread overview]
Message-ID: <bd57d7d5-c8f5-0bc9-c96f-37550557dca3@users.sourceforge.net> (raw)
In-Reply-To: <20171203162256.4ea0750d@vmware.local.home>
> Why would you compile the kernel without optimization?
I would like to see how big an effect finally is in such a build configuration
after specific source code adjustments.
> There's many places in the kernel that WILL NOT BUILD without optimization.
I did not really know this detail so far.
I noticed that the optimised build variants worked during my test comparisons.
> In fact, we do a lot of tricks to make sure that things work the way
> we expect it to, because we add broken code that only gets compiled out
> when gcc optimizes the code the way we expect it to be,
> and the kernel build will break otherwise.
Thanks for your information.
Can the software areas distinguished where such special handling matters?
Regards,
Markus
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the body of a message to majordomo at vger.kernel.org
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WARNING: multiple messages have this Message-ID (diff)
From: elfring@users.sourceforge.net (SF Markus Elfring)
Subject: [Linux-kselftest-mirror] Difficulties for compilation without extra optimisation
Date: Sun, 3 Dec 2017 22:56:51 +0100 [thread overview]
Message-ID: <bd57d7d5-c8f5-0bc9-c96f-37550557dca3@users.sourceforge.net> (raw)
Message-ID: <20171203215651.DDgGW52g36bKYd7v_vKaEO9B3XLobkrj7Lcetrq0vKI@z> (raw)
In-Reply-To: <20171203162256.4ea0750d@vmware.local.home>
> Why would you compile the kernel without optimization?
I would like to see how big an effect finally is in such a build configuration
after specific source code adjustments.
> There's many places in the kernel that WILL NOT BUILD without optimization.
I did not really know this detail so far.
I noticed that the optimised build variants worked during my test comparisons.
> In fact, we do a lot of tricks to make sure that things work the way
> we expect it to, because we add broken code that only gets compiled out
> when gcc optimizes the code the way we expect it to be,
> and the kernel build will break otherwise.
Thanks for your information.
Can the software areas distinguished where such special handling matters?
Regards,
Markus
--
To unsubscribe from this list: send the line "unsubscribe linux-kselftest" in
the body of a message to majordomo at vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
next prev parent reply other threads:[~2017-12-03 21:57 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-07 16:53 [PATCH RFC v1] nfs/write: Use common error handling code in nfs_lock_and_join_requests() SF Markus Elfring
2017-11-07 16:53 ` SF Markus Elfring
2017-12-03 14:15 ` Difficulties for compilation without extra optimisation SF Markus Elfring
2017-12-03 14:15 ` [Linux-kselftest-mirror] " SF Markus Elfring
2017-12-03 14:15 ` elfring
2017-12-03 14:15 ` SF Markus Elfring
2017-12-03 15:17 ` Trond Myklebust
2017-12-03 15:17 ` [Linux-kselftest-mirror] " Trond Myklebust
2017-12-03 15:17 ` trondmy
2017-12-03 15:17 ` Trond Myklebust
2017-12-03 15:17 ` Trond Myklebust
2017-12-03 21:22 ` Steven Rostedt
2017-12-03 21:22 ` [Linux-kselftest-mirror] " Steven Rostedt
2017-12-03 21:22 ` rostedt
2017-12-03 21:22 ` Steven Rostedt
2017-12-03 21:56 ` SF Markus Elfring [this message]
2017-12-03 21:56 ` [Linux-kselftest-mirror] " SF Markus Elfring
2017-12-03 21:56 ` elfring
2017-12-03 21:56 ` SF Markus Elfring
2017-12-04 2:40 ` Steven Rostedt
2017-12-04 2:40 ` [Linux-kselftest-mirror] " Steven Rostedt
2017-12-04 2:40 ` rostedt
2017-12-04 2:40 ` Steven Rostedt
2017-12-04 9:55 ` SF Markus Elfring
2017-12-04 9:55 ` [Linux-kselftest-mirror] " SF Markus Elfring
2017-12-04 9:55 ` elfring
2017-12-04 9:55 ` SF Markus Elfring
2017-12-04 9:00 ` SF Markus Elfring
2017-12-04 9:00 ` [Linux-kselftest-mirror] " SF Markus Elfring
2017-12-04 9:00 ` elfring
2017-12-04 9:00 ` SF Markus Elfring
2017-12-04 9:48 ` Steven Rostedt
2017-12-04 9:48 ` [Linux-kselftest-mirror] " Steven Rostedt
2017-12-04 9:48 ` rostedt
2017-12-04 9:48 ` Steven Rostedt
2017-12-04 10:18 ` SF Markus Elfring
2017-12-04 10:18 ` [Linux-kselftest-mirror] " SF Markus Elfring
2017-12-04 10:18 ` elfring
2017-12-04 10:18 ` SF Markus Elfring
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