linux-kernel - Re: [RFC V3 4/9] mm/migrate: add migrate_folios_batch

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Message-ID: <b525fbe7-8024-45be-a12e-771e0b8cdbc5@amd.com>
Date: Thu, 16 Oct 2025 14:47:37 +0530
From: "Garg, Shivank" <shivankg@....com>
To: Jonathan Cameron <jonathan.cameron@...wei.com>
Cc: akpm@...ux-foundation.org, david@...hat.com, ziy@...dia.com,
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Subject: Re: [RFC V3 4/9] mm/migrate: add migrate_folios_batch_move to batch
 the folio move operations



On 10/2/2025 4:33 PM, Jonathan Cameron wrote:
>> +	/* TODO:  Is there a better way of handling the poison
>> +	 * recover for batch copy, instead of falling back to serial copy?
> Is there a reason we might expect this to be common enough to care about
> not using the serial path?

Not common enough, I guess!

> 
>> +	 */
>> +	/* fallback to serial page copy if needed */
>> +	if (rc) {
>> +		dst = list_first_entry(dst_folios, struct folio, lru);
>> +		dst2 = list_next_entry(dst, lru);
>> +		list_for_each_entry_safe(folio, folio2, src_folios, lru) {
>> +			is_thp = folio_test_large(folio) &&
>> +				 folio_test_pmd_mappable(folio);
>> +			nr_pages = folio_nr_pages(folio);
>> +			rc = folio_mc_copy(dst, folio);