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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: 1hu4iyg6zuk7fs89z6dwtdozduu7esre X-Rspam-User: X-Rspamd-Queue-Id: 418871C0005 X-Rspamd-Server: rspam06 X-HE-Tag: 1747672964-603530 X-HE-Meta: U2FsdGVkX1+no+zLK/CmlVEF1pWinwIYFfrUpGGCUbxH7nE8feILaIH+x6FJQErhBWehkSs+sRaZBjoJeUx+t69+rxIClW6SuSAAEXOtf0PTK1V8wvptgNsKXjwQ92Mr83sIsa8bkAoAn/lh4g2Yfp7vGHB7H3d3EC7WkNERNUpvZtXFrqLE5TIPeHpQ2/sU644XWJUKPQl7Z5mX+vA/izA0jx8uctHy+KAvUAsTwZbHxEJ9QUMKNJIBUT4C5IrvUvlKr3R6ypD103FADKSa1pczZmt57LKTTk755z72pxRCUUfDjvvAK1YQTcFAxDKt9gy+OjWBZ0ML3qs3a5MkbijcE7E7ECK6FZldDLRNQpZXac/8PIbKGa5D13lOEy0JI/XqPGd2cf1Ripp8AeoDEO/qjblpmPRHowP+qs+FJgv2i/BiED5WVWLeuu1hxaRTIpD+XQtM1zstFCLb3BjRtvPHIW9GFJr8ExA5XKI/ms1ZNnTs4+W5OodfhdFMjN4KjVAz5oNpBEzOoG+eaMGtaSiaRAnwWi3e7u7hDDdm0LbicHeIRZ+OxVoIvB1RqVdjpbIdkgLmBUzLQU7Uznki8UM5goEofHLQJz60C7+oPAseb2TddIh9/8yESLhqY8lvAIN0UtHtR+Kd9xnvUlehcPCrFJOts38XAzbhmuJ988kJcgph8ZzNXSIvpvGQk10nBEiIhzGjTdweq7MUq7RLKvUldQpnfggoFcN2DdSoFc2wFzqAgGV/Bjod7SO9V8iSpm8x5xQbKB+ZyXGqTon2TxsAEJvU0U8aqvFfVUFdqbvrCZ8zR0eafBAspzeo0uynUSO2pElTyfPIrv/HE9RN6G+JFx9mNPIHKz2tg3YW11DgCZjYEXDuHYJrCJlvLXusyZSj4cUX2oKqS5dM3KaxK8ZnOtUhW9hdFCILWN880gQKKP5MCA5pdMDs53eMmn/e9ob6wQGyB+pDYPC5oZK rRFX+S7P Ux0BbBiUUfGeNInfunuWioyaNp3hRhB6PVoS3bquNsn533E+Dwx6F00hjqlU0YcFme7um62sJ692OMbksXXegecvaBuN36YI8TLOPPjXCefNUyWEoJcVhHN3WPeQZlDHyEQ8q X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: >>> +#ifdef CONFIG_MEMORY_ISOLATION >>> + if (flags & PB_migrate_isolate_bit) >>> + return MIGRATE_ISOLATE; >>> +#endif >> >> If you call get_pfnblock_flags_mask() with MIGRATETYPE_MASK, how could you ever get PB_migrate_isolate_bit? > > MIGRATETYPE_MASK is ((BIT(PB_migratetype_bits) - 1) | PB_migrate_isolate_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. > >> >> >> >> 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_{skip, isolate}(). > Then use {get, set, clear}_pfnblock_flags() for all migratetype operations. > > WDYT? In general, lgtm. I just hope we can avoid the "_mask" part and just handle it in these functions directly? > >>> + 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 != 8); >>> + /* extra one for MIGRATE_ISOLATE */ >>> + BUILD_BUG_ON(MIGRATE_TYPES > (1 << PB_migratetype_bits) + 1); >>> +#else >>> BUILD_BUG_ON(NR_PAGEBLOCK_BITS != 4); >>> BUILD_BUG_ON(MIGRATE_TYPES > (1 << PB_migratetype_bits)); >>> +#endif >>> bitmap = get_pageblock_bitmap(page, pfn); >>> bitidx = pfn_to_bitidx(page, pfn); >>> @@ -426,6 +453,13 @@ void set_pageblock_migratetype(struct page *page, int migratetype) >>> migratetype < MIGRATE_PCPTYPES)) >>> migratetype = MIGRATE_UNMOVABLE; >>> +#ifdef CONFIG_MEMORY_ISOLATION >>> + if (migratetype == 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 page *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 should make it consistent. ... and avoid tricks like "__maybe_unused" here :) -- Cheers, David / dhildenb