Re: [PATCH net-next v4 2/5] page_frag: unify gfp bits for order 3 page allocation

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]


On 2024/2/2 16:36, Paolo Abeni wrote:
> On Fri, 2024-02-02 at 10:10 +0800, Yunsheng Lin wrote:
>> On 2024/2/1 21:16, Paolo Abeni wrote:
>>> from the __page_frag_cache_refill() allocator - which never accesses
>>> the memory reserves.
>> I am not really sure I understand the above commemt.
>> The semantic is the same as skb_page_frag_refill() as explained above
>> as my understanding. Note that __page_frag_cache_refill() use 'gfp_mask'
>> for allocating order 3 pages and use the original 'gfp' for allocating
>> order 0 pages.
> You are right! I got fooled misreading 'gfp' as 'gfp_mask' in there.
>>> I'm unsure we want to propagate the __page_frag_cache_refill behavior
>>> here, the current behavior could be required by some systems.
>>> It looks like this series still leave the skb_page_frag_refill()
>>> allocator alone, what about dropping this chunk, too? 
>> As explained above, I would prefer to keep it as it is as it seems
>> to be quite obvious that we can avoid possible pressure for mm by
>> not using memory reserve for order 3 pages as we have the fallback
>> for order 0 pages.
>> Please let me know if there is anything obvious I missed.
> I still think/fear that behaviours changes here could have
> subtle/negative side effects - even if I agree the change looks safe.
> I think the series without this patch would still achieve its goals and
> would be much more uncontroversial. What about move this patch as a
> standalone follow-up?

Fair enough, will remove that for now.

> Thanks!
> Paolo
> .

[Index of Archives]     [KVM Development]     [Libvirt Development]     [Libvirt Users]     [CentOS Virtualization]     [Netdev]     [Ethernet Bridging]     [Linux Wireless]     [Kernel Newbies]     [Security]     [Linux for Hams]     [Netfilter]     [Bugtraq]     [Yosemite Forum]     [MIPS Linux]     [ARM Linux]     [Linux RAID]     [Linux Admin]     [Samba]

  Powered by Linux