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Date: Thu, 18 Feb 2016 14:03:33 +0900 From: Sergey Senozhatsky <sergey.senozhatsky.work@...il.com> To: Sergey Senozhatsky <sergey.senozhatsky.work@...il.com> Cc: Andrew Morton <akpm@...ux-foundation.org>, Minchan Kim <minchan@...nel.org>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, Sergey Senozhatsky <sergey.senozhatsky@...il.com> Subject: Re: [RFC PATCH 3/3] mm/zsmalloc: change ZS_MAX_PAGES_PER_ZSPAGE On (02/18/16 13:41), Sergey Senozhatsky wrote: > diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c > index 0c9f117..d5252d1 100644 > --- a/mm/zsmalloc.c > +++ b/mm/zsmalloc.c > @@ -73,12 +73,6 @@ > */ > #define ZS_ALIGN 8 > > -/* > - * A single 'zspage' is composed of up ZS_MAX_PAGES_PER_ZSPAGE discontiguous > - * 0-order (single) pages. > - */ > -#define ZS_MAX_PAGES_PER_ZSPAGE 6 > - > #define ZS_HANDLE_SIZE (sizeof(unsigned long)) > > /* > @@ -149,6 +143,21 @@ > #define ZS_SIZE_CLASS_DELTA (PAGE_SIZE >> 8) > > /* > + * We want to have at least this number of ->huge classes. > + */ > +#define ZS_MIN_HUGE_CLASSES_NUM 32 > +/* > + * A single 'zspage' is composed of up ZS_MAX_PAGES_PER_ZSPAGE discontiguous > + * 0-order (single) pages. > + * > + * The smallest huge class will have CLASS_SIZE * SIZE_CLASS_DELTA of > + * wasted space, calculate how many pages we need to fit a CLASS_SIZE > + * object there and, thus, to save a additional zspage. > + */ > +#define ZS_MAX_PAGES_PER_ZSPAGE \ > + (PAGE_SIZE / (ZS_MIN_HUGE_CLASSES_NUM * ZS_SIZE_CLASS_DELTA)) > + > +/* > * We do not maintain any list for completely empty or full pages > */ > enum fullness_group { and the difference between ZS_MIN_HUGE_CLASSES_NUM 57 (BASE number of ->huge classes) and ZS_MIN_HUGE_CLASSES_NUM 32 is: ZS_MIN_HUGE_CLASSES_NUM 57 (BASE) 1151078400 575501415 621494272 0 621494272 17 0 1 1151074304 575499905 621477888 0 621477888 17 0 1 1151074304 575516318 621363200 0 621363200 17 0 1 1151078400 575558182 621346816 0 621346816 17 0 1 1151078400 575599320 621531136 0 621531136 17 0 1 ZS_MIN_HUGE_CLASSES_NUM 32 1151074304 575483112 594194432 0 594194432 17 0 1 1151074304 575521895 593678336 0 593678336 17 0 1 1151074304 575570453 594173952 0 594173952 17 0 1 1151074304 575461842 594010112 0 594010112 17 0 1 1151074304 575537116 593879040 0 593879040 17 0 1 around 26MB of order-0 pages. -ss
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