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Shutemov" , Mel Gorman , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Richard Chang , linux-kernel@vger.kernel.org Subject: Re: [PATCH v4 1/4] mm/page_isolation: make page isolation a standalone bit. 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>>>> +#endif >>> >>> If you call get_pfnblock_flags_mask() with MIGRATETYPE_MASK, how coul= d you ever get PB_migrate_isolate_bit? >> >> MIGRATETYPE_MASK is ((BIT(PB_migratetype_bits) - 1) | PB_migrate_isola= te_bit), >> so it gets PB_migrate_isolate_bit. >> > > Oh ... that's confusing. > >>> >>> >>> I think what we should do is >>> >>> 1) Rename get_pfnblock_flags_mask() to get_pfnblock_flags() >>> >>> 2) Remove the mask parameter >>> >>> 3) Perform the masking in all callers. >> >> get_pfnblock_flags_mask() is also used by get_pageblock_skip() to >> get PB_migrate_skip. I do not think we want to include PB_migrate_skip= >> in the mask to confuse readers. > > The masking will be handled in the caller. > > So get_pageblock_skip() would essentially do a > > return get_pfnblock_flags() & PB_migrate_skip_bit; > > etc. Got it. Sounds good to me. Will do this. > >> >>> >>> >>> >>> Maybe, we should convert set_pfnblock_flags_mask() to >>> >>> void set_clear_pfnblock_flags(struct page *page, unsigned long >>> set_flags, unsigned long clear_flags); >>> >>> And better, splitting it up (or providing helpers) >>> >>> set_pfnblock_flags(struct page *page, unsigned long flags); >>> clear_pfnblock_flags(struct page *page, unsigned long flags); >>> >>> >>> This implies some more code cleanups first that make the code easier = to extend. >>> >> >> The same due to PB_migrate_skip. >> >> Based on your suggestion, we could make {set,get}_pfnblock_flags_mask(= ) >> internal APIs by prepending "__". They are only used by the new >> {get, set, clear}_pfnblock_flags() and {get, set, clear}_pageblock_{sk= ip, isolate}(). >> Then use {get, set, clear}_pfnblock_flags() for all migratetype operat= ions. >> >> WDYT? > > In general, lgtm. I just hope we can avoid the "_mask" part and just ha= ndle it in these functions directly? Sounds good to me. Will put this and "#define NR_PAGEBLOCK_BITS (roundup_pow_of_two(__NR_PAGEBLOCK_BITS))" in a cleanup patch before Patch 1. > >> >>>> + return flags; >>>> } >>>> /** >>>> @@ -402,8 +423,14 @@ void set_pfnblock_flags_mask(struct page *page,= unsigned long flags, >>>> unsigned long bitidx, word_bitidx; >>>> unsigned long word; >>>> +#ifdef CONFIG_MEMORY_ISOLATION >>>> + BUILD_BUG_ON(NR_PAGEBLOCK_BITS !=3D 8); >>>> + /* extra one for MIGRATE_ISOLATE */ >>>> + BUILD_BUG_ON(MIGRATE_TYPES > (1 << PB_migratetype_bits) + 1); >>>> +#else >>>> BUILD_BUG_ON(NR_PAGEBLOCK_BITS !=3D 4); >>>> BUILD_BUG_ON(MIGRATE_TYPES > (1 << PB_migratetype_bits)); >>>> +#endif >>>> bitmap =3D get_pageblock_bitmap(page, pfn); >>>> bitidx =3D pfn_to_bitidx(page, pfn); >>>> @@ -426,6 +453,13 @@ void set_pageblock_migratetype(struct page *pag= e, int migratetype) >>>> migratetype < MIGRATE_PCPTYPES)) >>>> migratetype =3D MIGRATE_UNMOVABLE; >>>> +#ifdef CONFIG_MEMORY_ISOLATION >>>> + if (migratetype =3D=3D MIGRATE_ISOLATE) { >>>> + set_pfnblock_flags_mask(page, PB_migrate_isolate_bit, >>>> + page_to_pfn(page), PB_migrate_isolate_bit); >>>> + return; >>>> + } >>>> +#endif >>>> set_pfnblock_flags_mask(page, (unsigned long)migratetype, >>>> page_to_pfn(page), MIGRATETYPE_MASK); >>>> } >>>> diff --git a/mm/page_isolation.c b/mm/page_isolation.c >>>> index b2fc5266e3d2..751e21f6d85e 100644 >>>> --- a/mm/page_isolation.c >>>> +++ b/mm/page_isolation.c >>>> @@ -15,6 +15,17 @@ >>>> #define CREATE_TRACE_POINTS >>>> #include >>>> +static inline bool __maybe_unused get_pageblock_isolate(struct pa= ge *page) >>>> +{ >>>> + return get_pfnblock_flags_mask(page, page_to_pfn(page), >>>> + PB_migrate_isolate_bit); >>>> +} >>>> +static inline void clear_pageblock_isolate(struct page *page) >>>> +{ >>>> + set_pfnblock_flags_mask(page, 0, page_to_pfn(page), >>>> + PB_migrate_isolate_bit); >>>> +} >>> >>> Should these reside in include/linux/pageblock-flags.h, just like the= >>> CONFIG_COMPACTION "skip" variants? >> >> They are only used inside mm/page_isolation.c, so I would leave them >> here until other users come out. > > get_pageblock_skip() and friends are also only used in mm/compaction.c.= > > Having these simple wrapper as inline functions in the same header shou= ld make it consistent. > > ... and avoid tricks like "__maybe_unused" here :) OK, will do this. -- Best Regards, Yan, Zi