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Torvalds' Comments On Linux Scheduler Woes: "Pure Garbage"

Submitted by Roy Schestowitz on Sunday 5th of January 2020 04:31:38 PM Filed under
Linux

As you may recall a few days ago there was the information on the Linux kernel scheduler causing issues for Google Stadia game developers. The scheduler was to blame and in particular Linux's spinlocks. Linus Torvalds has now commented on the matter.

In a mailing list discussion on the reported Linux kernel troubles, Linus Torvalds wrote, "The whole post seems to be just wrong, and is measuring something completely different than what the author thinks and claims it is measuring. First off, spinlocks can only be used if you actually know you're not being scheduled while using them...It basically reads the time before releasing the lock, and then it reads it after acquiring the lock again, and claims that the time difference is the time when no lock was held. Which is just inane and pointless and completely wrong. That's pure garbage."

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Linux 5.5 Lands Fix For The AppArmor Performance Regression

Submitted by Roy Schestowitz on Sunday 5th of January 2020 04:33:53 PM.
  • Linux 5.5 Lands Fix For The AppArmor Performance Regression

    Linux 5.5 as of this morning should have one less performance regression in tow if you are running on Debian/Ubuntu or otherwise having AppArmor enabled.

    The Linux 5.5 bisected regression back around Christmas is now resolved as of last night's Git code for Linux 5.5.

    With this set of AppArmor fixes is a change to only get a label reference if the fast path check fails. That in turn fixes the Linux 5.5 AppArmor performance regression.

Clickbait over 'Pure Garbage'

Submitted by Roy Schestowitz on Monday 6th of January 2020 10:24:42 AM.

Linux scheduler issue claims garbage

Submitted by Rianne Schestowitz on Monday 6th of January 2020 04:51:54 PM.
  • Linux scheduler issue claims garbage

    Linus Torvalds says that claims by C++ game developer Malte Skarupke that his spinlocks experiments had discovered the Linux kernel had a scheduler issue were garbage.

    Torvalds said the whole post seems to be just wrong and is measuring something completely different than what the author thinks and claims it is measuring.

    He said that spinlocks can only be used if you actually know you're not being scheduled while using them. But the blog post author seems to be implementing his own spinlocks in userspace with no regard for whether the lock user might be scheduled or not. And the code used for the claimed "lock not held" timing is complete garbage.

Torvalds calls it 'pure garbage' that Linux is to blame

Submitted by Rianne Schestowitz on Monday 6th of January 2020 04:56:15 PM.
  • Torvalds calls it 'pure garbage' that Linux is to blame for Stadia port issues

    Linus Torvalds has called a blogger's claim that Linux is to blame for Google Stadia port issues "pure garbage".

    In a blog post, developer Malte Skarupke pointed the finger at the Linux scheduler as being the culprit for issues when porting games to Google's cloud gaming platform Stadia.

    Every millisecond delay impacts the experience when gaming. Skarupke gave this overview as to why he came to the conclusion the scheduler was causing the problem...

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