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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 Vl= astimil Babka:
Thank you very much indeed for your ad= vice.


Hi Vlast= imil Babka, schwidefsky,heiko.carstens= :

It is a t= emporary patch to consult&nb= sp;experts:
Is it possible to merge the optimization idea and the = implementation
<= font face=3D"Microsoft YaHei UI, Tahoma">method to the baseline?

If there is a chance,i would develop a forma= l patch based on the
lastest linux and it will split into serveral p= acthes.

I hope you can give us your opinions, thank you very much.

=0A=

=0A=
lipeifeng@oppo.com
=0A=
 
Date: 2021-04-16 19:06
To: lipeifeng; peifengl55; schwid= efsky; heiko.carstens<= /div>
Subject= : Re: [RFC] mm: support multi_freearea to the reduction of externa= l fragmentation
On 4/14/21 4:38 AM, lipeifeng@op= po.com wrote:
=0A=
> From: lipeifeng <lipeifeng@oppo.com>
=0A=
>
=0A=
> This patch would "sort" the free-pages in buddy by page= s-PFN to concentrate
=0A=
> low-order-pages allocation in the front area of memory and high-o= rder-pages
=0A=
> allcation on the contrary so that few memory-pollution in the bac= k area of
=0A=
> memory and the probablity of high-order-pages allocation would be= increased
=0A=
> significantly.
=0A=
> -----------------------------------------------------------------= ------
=0A=
>
=0A=
>   1) Divide memory into several segments by pages-PFN=0A=
>      "Multi_freearea" would di= vide memory into FREE_AREA_COUNTS segments
=0A=
>      by pages-PFN,each memory-segment co= rresponds to a free_area.
=0A=
>
=0A=
>      Example: machine(4G of physical mem= ery) and FREE_AREA_COUNTS(4):
=0A=
>         page-PFN:0x0 = ;    0x40000(1G)   0x80000(2G)  0xc0000(3G) 0= xFFFFF(4G)
=0A=
>           =        |------------|--------------|---------= -----|-------------|
=0A=
>         free_area:  = [0][]           [1][]&nbs= p;          [2][]  &= nbsp;     [3][]
=0A=
>
=0A=
>      NOTE: Selecting the corresponding f= reearea when pages are freed back
=0A=
>        to buddy:
=0A=
>         - pages-PFN[0, fr= ee_area_segment[0].max_pfn] -> free_area[0][]
=0A=
>         - pages-PFN[free_= area_segment[flc - 1].max_pfn,
=0A=
>           &nbs= p; free_area_segment[flc].max_pfn] -> free_area[flc][]
=0A=
>           =          (flc > 0)
=0A=
>
=0A=
>      By this way, all pages in the same = segment/free_area is within a
=0A=
>      certain range of pages-PFN.
= =0A=
>
=0A=
>   2) Select the corresponding freearea to alloc-pages=0A=
>      "Multi_freearea" would se= lect the corresponding free_area by the
=0A=
>      allocation-order when alloc-pages.<= /div>=0A=
>         - order < = ; HIGH_ORDER_TO_FLC:
=0A=
>         free_area[0] -> ..= . -> free_area[FREE_AREA_COUNTS - 1]
=0A=
>         - order >=3D H= IGH_ORDER_TO_FLC:
=0A=
>         free_area[FREE_AREA_C= OUNTS - 1] -> ... -> free_area[0]
=0A=
>
=0A=
>      Example:
=0A=
>         The machine(4G of= physical memery) and FREE_AREA_COUNTS(4)
=0A=
>         and HIGH_ORDER_TO= _FLC(3).
=0A=
> If user allocs page(order =3D 0),it would take page from
= =0A=
> free_area[0][] first, if that fails,try free_area[1][] and so on= .
=0A=
> If user allocs page(order =3D 4),it would take page from
= =0A=
> free_area[3][] first, if that fails,try free_area[2][] and so on= .
=0A=
>
=0A=
>      By this way,low-order pages will be= concentrated in the front area
=0A=
>      of memory.Because of few memory-pol= lution in the back area of memory,
=0A=
>      the sussessful probablity of high-o= rder allocation would be improved.
=0A=
>
=0A=
>   3) Adjust the location of free-pages in the free_list=
=0A=
>      "Multi_freearea" would pl= ace free-pages in the head of free_list if
=0A=
>      pages-PFN is smaller than free_area= _segment[flc]->median_pfn and in
=0A=
>      the tail of free_list on the contra= ry.
=0A=
>
=0A=
>      Example:
=0A=
>         page-PFN: &n= bsp;      free_area_segment[flc]->median_pfn=0A=
>           =             &nb= sp;            =      |
=0A=
>         free_list: page-&= gt;page->page->...|...page->page->page
=0A=
>         pages-PFN:| =   < median_pfn      |  >=3D median= _pfn    |
=0A=
>
=0A=
>      Because it would take pages from th= e head of the freelist first in
=0A=
>      buddy system,the free-pages in the = tail are more likely to keep in the
=0A=
>      buddy system.The closer the PFN of = pages kept in buddy system, the
=0A=
>      greater the probablity of merging t= hat into high-order pages.
=0A=
 
=0A=
I think this part 3) would be worth to be tried separately first, as i= t's not a
=0A=
big change compared to the other ones.
=0A=
=0A= = ------=_001_NextPart202524557785_=------