From: David Hildenbrand <david@redhat.com>
To: Minchan Kim <minchan@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-mm <linux-mm@kvack.org>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Vlastimil Babka <vbabka@suse.cz>, John Dias <joaodias@google.com>,
Suren Baghdasaryan <surenb@google.com>,
pullip.cho@samsung.com
Subject: Re: [RFC 0/7] Support high-order page bulk allocation
Date: Mon, 17 Aug 2020 19:03:47 +0200 [thread overview]
Message-ID: <258b16d3-ab8c-03c3-c306-d56b32678a0c@redhat.com> (raw)
In-Reply-To: <f047f2b2-9f62-cbf4-3c6b-a0f3bf1e9406@redhat.com>
>>>> A usecase is device can set a exclusive CMA area up when system boots.
>>>> When device needs 4800 * order-4 pages, it could call this bulk against
>>>> of the area so that it could effectively be guaranteed to allocate
>>>> enough fast.
>>>
>>> Just wondering
>>>
>>> a) Why does it have to be fast?
>>
>> That's because it's related to application latency, which ends up
>> user feel bad.
>
> Okay, but in theory, your device-needs are very similar to
> application-needs, besides you requiring order-4 pages, correct? Similar
> to an application that starts up and pins 300M (or more), just with
> ordr-4 pages.
Pinning was probably misleading.
I meant either actual pinning, like vfio pins all pages backing a VM
e.g., in QEMU, or mlocking+populating all memory.
--
Thanks,
David / dhildenb
next prev parent reply other threads:[~2020-08-17 17:04 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-14 17:31 Minchan Kim
2020-08-14 17:31 ` [RFC 1/7] mm: page_owner: split page by order Minchan Kim
2020-08-14 17:31 ` [RFC 2/7] mm: introduce split_page_by_order Minchan Kim
2020-08-14 17:31 ` [RFC 3/7] mm: compaction: deal with upcoming high-order page splitting Minchan Kim
2020-08-14 17:31 ` [RFC 4/7] mm: factor __alloc_contig_range out Minchan Kim
2020-08-14 17:31 ` [RFC 5/7] mm: introduce alloc_pages_bulk API Minchan Kim
2020-08-17 17:40 ` David Hildenbrand
2020-08-14 17:31 ` [RFC 6/7] mm: make alloc_pages_bulk best effort Minchan Kim
2020-08-14 17:31 ` [RFC 7/7] mm/page_isolation: avoid drain_all_pages for alloc_pages_bulk Minchan Kim
2020-08-14 17:40 ` [RFC 0/7] Support high-order page bulk allocation Matthew Wilcox
2020-08-14 20:55 ` Minchan Kim
2020-08-18 2:16 ` Cho KyongHo
2020-08-18 9:22 ` Cho KyongHo
2020-08-16 12:31 ` David Hildenbrand
2020-08-17 15:27 ` Minchan Kim
2020-08-17 15:45 ` David Hildenbrand
2020-08-17 16:30 ` Minchan Kim
2020-08-17 16:44 ` David Hildenbrand
2020-08-17 17:03 ` David Hildenbrand [this message]
2020-08-17 23:34 ` Minchan Kim
2020-08-18 7:42 ` Nicholas Piggin
2020-08-18 7:49 ` David Hildenbrand
2020-08-18 15:15 ` Minchan Kim
2020-08-18 15:58 ` Matthew Wilcox
2020-08-18 16:22 ` David Hildenbrand
2020-08-18 16:49 ` Minchan Kim
2020-08-19 0:27 ` Yang Shi
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