Re: [Question] The necessity of transaction ID in SLUB.

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To: Christoph Lameter <cl@xxxxxxxxxx>
Subject: Re: [Question] The necessity of transaction ID in SLUB.
From: Wonhyuk Yang <vvghjk1234@xxxxxxxxx>
Date: Wed, 24 Nov 2021 08:59:20 +0900
Cc: linux-mm@xxxxxxxxx, Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
In-reply-to: <CAEcHRTrTc-DzeyU4fetfyU3pQCS6A0pPexGe5c5yB94Z88ueHg@mail.gmail.com>
References: <CAEcHRTpdMX=dqTwNrw7wjdK_GhZ4gwkqtOYeMnNxt_JXr-eG6w@mail.gmail.com> <alpine.DEB.2.22.394.2111221023420.202803@gentwo.de> <CAEcHRTq6=HL6TWbrCC=dkuQ7Rgrke6nYL-dakoK_Oxg4ZfFK1g@mail.gmail.com> <alpine.DEB.2.22.394.2111231034140.13033@gentwo.de> <CAEcHRTrTc-DzeyU4fetfyU3pQCS6A0pPexGe5c5yB94Z88ueHg@mail.gmail.com>

Now I know what I missed!

I missed that the freepointer may no more be valid because any other
preemptions. Also, It is possible that cpu_slab->freelist is unchanged
but it's freepointer may be changed. This is why we guarantee that
there is no update before, right?

Thanks to the answer, I was able to solve my question.

References:
- [Question] The necessity of transaction ID in SLUB.
  - From: Wonhyuk Yang
- Re: [Question] The necessity of transaction ID in SLUB.
  - From: Christoph Lameter
- Re: [Question] The necessity of transaction ID in SLUB.
  - From: Wonhyuk Yang
- Re: [Question] The necessity of transaction ID in SLUB.
  - From: Christoph Lameter
- Re: [Question] The necessity of transaction ID in SLUB.
  - From: Wonhyuk Yang

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