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Received: from willy by casper.infradead.org with local (Exim 4.97.1 #2 (Red Hat Linux)) id 1rom6a-0000000GkGm-0muB; Mon, 25 Mar 2024 15:19:20 +0000 Date: Mon, 25 Mar 2024 15:19:20 +0000 From: Matthew Wilcox To: Andrew Morton Cc: linux-mm@kvack.org, David Hildenbrand , Vlastimil Babka , Miaohe Lin , Muchun Song , Oscar Salvador Subject: Re: [PATCH 7/9] mm: Free up PG_slab Message-ID: References: <20240321142448.1645400-1-willy@infradead.org> <20240321142448.1645400-8-willy@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240321142448.1645400-8-willy@infradead.org> X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 5965BA0028 X-Stat-Signature: 11p6s6qraje1opphzkxg875udzun1nwz X-Rspam-User: X-HE-Tag: 1711379962-28925 X-HE-Meta: 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 ZQxzVtsK v3UkfwBfGSVJkKxXmw+Qx4hk4cK9klWejiCgFctMM4120HTskLp40Fl2J/iKT5jP2pUcMMlfsn0trrouyAiZjp9RFwzwhDRryY6mIy0mGGjK6Coa2kNASQ/FfJ8G8tXpxMZb8D/Ttaiu/kqIStqS7ZMTRyP/VGFqr3f6br1Y5lXG67jgpUHRTbp7y4g== 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: On Thu, Mar 21, 2024 at 02:24:45PM +0000, Matthew Wilcox (Oracle) wrote: > Reclaim the Slab page flag by using a spare bit in PageType. We are > perennially short of page flags for various purposes, and now that > the original SLAB allocator has been retired, SLUB does not use the > mapcount/page_type field. This lets us remove a number of special cases > for ignoring mapcount on Slab pages. Update vmcoreinfo: diff --git a/kernel/vmcore_info.c b/kernel/vmcore_info.c index 23c125c2e243..1d5eadd9dd61 100644 --- a/kernel/vmcore_info.c +++ b/kernel/vmcore_info.c @@ -198,7 +198,8 @@ static int __init crash_save_vmcoreinfo_init(void) VMCOREINFO_NUMBER(PG_private); VMCOREINFO_NUMBER(PG_swapcache); VMCOREINFO_NUMBER(PG_swapbacked); - VMCOREINFO_NUMBER(PG_slab); +#define PAGE_SLAB_MAPCOUNT_VALUE (~PG_slab) + VMCOREINFO_NUMBER(PAGE_SLAB_MAPCOUNT_VALUE); #ifdef CONFIG_MEMORY_FAILURE VMCOREINFO_NUMBER(PG_hwpoison); #endif