linux-kernel - Re: [PATCH v8 21/23] maple_tree: Prefilled sheaf conversion and testing

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Message-ID: <e8735d27-2917-402a-86fa-7446b1acbfcc@suse.cz>
Date: Mon, 29 Sep 2025 09:30:30 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: Suren Baghdasaryan <surenb@...gle.com>
Cc: "Liam R. Howlett" <Liam.Howlett@...cle.com>,
 Christoph Lameter <cl@...two.org>, David Rientjes <rientjes@...gle.com>,
 Roman Gushchin <roman.gushchin@...ux.dev>, Harry Yoo <harry.yoo@...cle.com>,
 Uladzislau Rezki <urezki@...il.com>,
 Sidhartha Kumar <sidhartha.kumar@...cle.com>, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org, rcu@...r.kernel.org,
 maple-tree@...ts.infradead.org
Subject: Re: [PATCH v8 21/23] maple_tree: Prefilled sheaf conversion and
 testing

On 9/27/25 03:08, Suren Baghdasaryan wrote:
> On Wed, Sep 10, 2025 at 1:01 AM Vlastimil Babka <vbabka@...e.cz> wrote:
>>
>> From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
>>
>> Use prefilled sheaves instead of bulk allocations. This should speed up
>> the allocations and the return path of unused allocations.
>>
>> Remove the push and pop of nodes from the maple state as this is now
>> handled by the slab layer with sheaves.
>>
>> Testing has been removed as necessary since the features of the tree
>> have been reduced.
>>
>> Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
>> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
> 
> Couple nits but otherwise looks great!
> 
> Reviewed-by: Suren Baghdasaryan <surenb@...gle.com>
> 
>> ---
>>  include/linux/maple_tree.h       |   6 +-
>>  lib/maple_tree.c                 | 326 ++++++---------------------
>>  tools/testing/radix-tree/maple.c | 461 ++-------------------------------------
>>  tools/testing/shared/linux.c     |   5 +-
>>  4 files changed, 88 insertions(+), 710 deletions(-)
>>
>> diff --git a/include/linux/maple_tree.h b/include/linux/maple_tree.h
>> index bafe143b1f783202e27b32567fffee4149e8e266..166fd67e00d882b1e6de1f80c1b590bba7497cd3 100644
>> --- a/include/linux/maple_tree.h
>> +++ b/include/linux/maple_tree.h
>> @@ -442,7 +442,8 @@ struct ma_state {
>>         struct maple_enode *node;       /* The node containing this entry */
>>         unsigned long min;              /* The minimum index of this node - implied pivot min */
>>         unsigned long max;              /* The maximum index of this node - implied pivot max */
>> -       struct maple_alloc *alloc;      /* Allocated nodes for this operation */
>> +       struct slab_sheaf *sheaf;       /* Allocated nodes for this operation */
>> +       unsigned long node_request;
> 
> No comment for this poor fella?

adding: /* The number of nodes to allocate for this operation */