linux-kernel - Re: [PATCH v2 11/61] mm: Remove rb tree.

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Message-ID: <3104a9d0-b8b3-46ed-4f10-1c1f0e5eff92@redhat.com>
Date:   Mon, 23 Aug 2021 11:49:22 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Liam Howlett <liam.howlett@...cle.com>,
        "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Song Liu <songliubraving@...com>,
        Davidlohr Bueso <dave@...olabs.net>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        David Rientjes <rientjes@...gle.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Rik van Riel <riel@...riel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Michel Lespinasse <walken.cr@...il.com>
Subject: Re: [PATCH v2 11/61] mm: Remove rb tree.

On 17.08.21 17:47, Liam Howlett wrote:
> From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
> 
> Remove the RB tree and start using the maple tree for vm_area_struct
> tracking.
> 
> Drop validate_mm() calls in expand_upwards() and expand_downwards() as
> the lock is not held.
> 
> Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>


[...]


Why are we reshuffling the code below? This either needs a good 
justification or should just be dropped as it introduces noise. Maybe I 
am missing something important.

>   	/*
> @@ -427,6 +414,11 @@ struct vm_area_struct {
>   	pgprot_t vm_page_prot;
>   	unsigned long vm_flags;		/* Flags, see mm.h. */
>   
> +	/* Information about our backing store: */
> +	unsigned long vm_pgoff;		/* Offset (within vm_file) in PAGE_SIZE
> +					 * units
> +					 */
> +	struct file *vm_file;		/* File we map to (can be NULL). */
>   	/*
>   	 * For areas with an address space and backing store,
>   	 * linkage into the address_space->i_mmap interval tree.
> @@ -449,12 +441,9 @@ struct vm_area_struct {
>   	/* Function pointers to deal with this struct. */
>   	const struct vm_operations_struct *vm_ops;
>   
> -	/* Information about our backing store: */
> -	unsigned long vm_pgoff;		/* Offset (within vm_file) in PAGE_SIZE
> -					   units */
> -	struct file * vm_file;		/* File we map to (can be NULL). */
>   	void * vm_private_data;		/* was vm_pte (shared mem) */
>   
> +

Another unrelated change (there seem to some more in this patch)


-- 
Thanks,

David / dhildenb