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YXZpZCAvIGRoaWxkZW5iDQogDQo= ------=_002_NextPart364472030224_=---- Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable body { line-height: 1.5; }blockquote { margin-top: 0px; margin-bottom:= 0px; margin-left: 0.5em; }body { font-size: 10.5pt; font-family: 'Microsof= t YaHei UI'; color: rgb(0, 0, 0); line-height: 1.5; }= =0A=
Hi David Hildenbrand=EF=BC=9A

>> And you don't mention what the baseline = configuration was. For example,
&g= t;> how was compaction configured?
 
>> Just to clarif= y, what is monkey?
 
>> Monkey HTTP server? MonkeyTest di= sk benchmark? UI/Application Exerciser
>> Monkey?
------= ---------------------------------------------------------------------------= ----
=0A=
I am sorry that i didn't  give a clear explanation = about Monkey.
It meant  "UI/Application Exerciser Monkey" from google.<= /div>

Excu= se me, let me introduce our test:

1. r= ecord COMPACT_STALL
We tested the patch on li= nux-4.4/linux-4.9/linux-4.14/linux-4.19 and the
results sho= ws that the patch is effective in reducing COMPACTSTALL.
  &nbs= p; - monkey for 12 hours.
    - record COMPACTST= ALL after test.

Test-result: reduced CO= MPACTSTALL by 95.6% with the patch.
(the machine with 4 gigabytes= of physical memery and in linux-4.19.)
-------------------------= --------
         &n= bsp;           | &nb= sp; COMPACTSTALL
---------------------------------
&nbs= p;  ori              |  &= nbsp;  2189
---------------------------------
opti= mization |      95
---------------------= ------------

I fully agree with the value of compa= ction, but compaction also bring cpu
consumption and will increas= e the time of alloc_stall. So if we can let more
free high-orders= -pages in buddy instead of signal pages, it will decrease
COMPACT= _STALL and speed up memory allocation.

2. record <= /span>the speed of the high-orders-pages allocation()
Before and af= ter optimization, we tested the speed of the high-orders-page= s allocation
after 120-hours-Monkey in 10 Android= mobile phones. and the result show that
the = ;speed has been increased by more than= 18%.

Also, we do = some test designed by us: 
(the machine with 4 g= igabytes of physical memery and in linux-4.19.)
m= odel the usage of users, and constantly start and
operate the diffrent application for 120h, and we record COMPACT_STALL is = decreased by
90+% and speed = of the high-orders-pages is increaed by 15+%.
and I have some question, i hope you can guide= me if when you are free.
1) What is the compaction configured?
    Dost= it meant the members in zone? like as follows:
   = ;     unsigned int= compact_considered;
        unsigned int compact_defer_shift;
    &n= bsp;   int compact_order_failed;
        bool compact_blockskip= _failed;
    Or the some Macro variable? like as follows:=
     = ;   PAGE_ALLOC_COSTLY_ORDER =3D 3
        MIN_COMPACT_PRIORITY = =3D 1
        MAX_COMPACT_RETRIES =3D 16

=
>> 1) multi freearea (which might
>> be problematic with sparcity)
2) Can you pls tell me what is soarcity and what is the impact of this?
    and whether there are some documents about it?



<= /div>

Thanks you indeed, we will do the test and see if ther= e's any revenue.

=0A=
lipeifeng@oppo.com
=0A=
 
Fr= om: David Hildenbrand
Date: 2021-04-26 16:37
C= C: linux-s390; <= a href=3D"mailto:linux-kernel@vger.kernel.org">linux-kernel; linux-mm
Subject: Re:= [RFC] mm: support multi_freearea to the reduction of external fragmentatio= n
On 26.04.21 05:19, lipeifeng@oppo.com wrote:=0A=
>
=0A=
>  >> Let's consider part 3 only and ignore the 1) multi= freearea (which might
=0A=
>  >> be problematic with sparcity) and 2) the modified = allocation scheme
=0A=
>  >> (which doesn't yet quite sense to me yet, e.g., be= cause we group by
=0A=
>  >> mobility and have compaction in place; I assume th= is really only helps
=0A=
>  >> in some special cases -- like the test case you ar= e giving; I might be
=0A=
>  >> wrong)
=0A=
>  >> Right now, we decide whether to but to head or tai= l based on how likely
=0A=
>  >> it is that we might merge to a higher-order page (= buddy_merge_likely())
=0A=
>  >> in the future. So we only consider the current &qu= ot;neighborhood" of the
=0A=
>  >> page we're freeing. As we restrict our neighborhoo= d to MAX_ORDER - 1
=0A=
>  >> pages (what we can actually merge). Of course, we = can easily be wrong
=0A=
>  >> here. Grouping by movability and compaction only h= elps to some degree I
=0A=
>  >> guess.
=0A=
>  >> AFAIK, what you propose is basing the decisions wh= ere to place a page
=0A=
>  >> (in addition?) on a median_pfn. Without 1) and 2) = I cannot completely
=0A=
>  >> understand if 3) itself would help at all (and how= to set the
=0A=
>  >> median_pfn). But it would certainly be interesting= if we can tweak the
=0A=
>  >> current logic to better identify merge targets sim= ply by tweaking
=0A=
>  >> buddy_merge_likely() or the assumptions it is maki= ng.
=0A=
>
=0A=
>
=0A=
>
=0A=
> Hi David Hildenbrand=EF=BC=8CVlastimil Babka:
=0A=
>      Thank you very much indeed for advices.
= =0A=
>
=0A=
>>> 2) the modified allocation scheme
=0A=
>  >> (which doesn't yet quite sense to me yet, e.g., be= cause we group by
=0A=
>  >> mobility and have compaction in place; I assume th= is really only helps
=0A=
>  >> in some special cases -- like the test case you ar= e giving;
=0A=
>   -----------------------------------------------------= ----------------------------
=0A=
> 1) Divide memory into several segments by pages-PFN
=0A=
> 2) Select the corresponding freearea to alloc-pages
=0A=
>      These two parts art for the same purpose:=0A=
> low-order-pages allocation will be concentrated in the front area= of
=0A=
> physical memory
=0A=
> so that few memory-pollution in the back area of memory, the suss= essful
=0A=
> probablity
=0A=
> of high-order allocation would be improved.
=0A=
>
=0A=
>      I think that it would help in almost all case= s of high-oder-pages
=0A=
> allocation, instead
=0A=
>      of special case, because it can let more high= -order free-pages in
=0A=
> buddy, example:
=0A=
 
=0A=
See, and I am not convinced that this is the case, because you really =
=0A=
only report one example (Monkey) and I have to assume it is a special =
=0A=
case then.
=0A=
 
=0A=
>
=0A=
>   * when user alloc 64K bytes, if the unit is page(4K b= ytes) and it
=0A=
>     needs to 16 times.
=0A=
>
=0A=
> if the unit is 64Kbytes, it only takes once.
=0A=
>
=0A=
>   * if there are more free-high-order-pages in buddy th= at few
=0A=
>     compact-stall in
=0A=
>
=0A=
> alloction-process, the allocstall-time would be shortened.
= =0A=
>
=0A=
>      We tested the speed of the high-orders-pages(= order=3D4 and order =3D 8)
=0A=
> allocation
=0A=
> after monkey and found that it increased by more than 18%.
= =0A=
>
=0A=
 
=0A=
And you don't mention what the baseline configuration was. For example= ,
=0A=
how was compaction configured?
=0A=
 
=0A=
Just to clarify, what is monkey?
=0A=
 
=0A=
Monkey HTTP server? MonkeyTest disk benchmark? UI/Application Exercise= r
=0A=
Monkey?
=0A=
 
=0A=
> 3) Adjust the location of free-pages in the free_list
=0A=
>>>Without 1) and 2) I cannot completely
=0A=
>  >>understand if 3) itself would help at all (and how = to set the median_pfn)
=0A=
> -----------------------------------------------------------------= ------------------------------------
=0A=
>      Median_pfn is set by the range of pages-PFN o= f free_area. if part
=0A=
> 3) would be tried separately
=0A=
>      without 1) and 2), the simple setting is the = median of the entire
=0A=
> memory. But i think it will play the
=0A=
> better role in optimization based on the 1) and 2).
=0A=
>
=0A=
>
=0A=
>
=0A=
>  >> Last but not least, there have to be more benchmar= ks and test cases that
=0A=
>  >> proof that other workload won't be degraded to a d= egree that people
=0A=
>  >> care; as one example, this includes runtime overhe= ad when
=0A=
>>> allocating/freeing pages.
=0A=
> ---------------------------------------------
=0A=
> 1. For modification of buddy: the modified allocation scheme 1)+2= )
=0A=
>      Is thers any standard detailed test-list &nbs= p;of the modified
=0A=
> allocation in the community? like benchmarks
=0A=
> or any other tests? if  i pass the test required by communir= y that can
=0A=
> proof the patch will not degraded
=0A=
> to a degree that people care and can merge it in the baseline?=0A=
 
=0A=
IIRC, there are plenty. One example is will-it-scale.
=0A=
 
=0A=
Have a look at https://apc01.safelinks.protection.outlook.com/?url=3Dh= ttps%3A%2F%2Fgithub.com%2Fintel%2Flkp-tests.git&amp;data=3D04%7C01%7Cli= peifeng%40oppo.com%7C05651d116ca04321f76a08d9088e8841%7Cf1905eb1c35341c5951= 662b4a54b5ee6%7C0%7C0%7C637550230524688657%7CUnknown%7CTWFpbGZsb3d8eyJWIjoi= MC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;s= data=3DBnYgprqlCIolSaPyRhCRvyugE9Kif27AtNgeRYKMZkw%3D&amp;reserved=3D0<= /div>=0A=
 
=0A=
 
=0A=
--
=0A=
Thanks,
=0A=
 
=0A=
David / dhildenb
=0A=
 
=0A=
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