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 KTIOsVlS 6++fEWW23UDRC6cGzQ0eoxRJIr4gxGo6FwqKVP4NH27vmazty3hHh6zeh2E1BNeO0yq/AHzfmbpK7b0JxM/BMrfM/gHPGOhZ4bE2xokCqDj+MsfM9ePMPVb8xoQvpS+kJHneVyCG8ukJlF2K9k9/H3aQ+BKPC940Q5tLNTd7HaQWkpQ3AVz7QoQCXVrJ5KMmGk1a11dCr24mbPr/NhdfMEtoq4U0LsOtCQZj53b1SdHbf0h32iif/K0e7WCTocWHIvaKTB6imierwhS/45mKGsgKZXSUMJt4OHSPaExpwXB/83aOdPZBr+l7OtnKhx3zBSfQH4lHOS9px5qND1kB0oiGr46YtLVoNjAlMi/Fj8u2KaAMkdD1qk9ZcwhyKf/UcvqZyDcMtejm7vuZSK/BzQ6tyQs0j0X+LgJYDOomrkn+SV73g0h+apx4Ea3KSYzoHAqS3aoAWw1TMmnVj+fOf98KCkA== 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: On 07/12/23 11:14, Mike Kravetz wrote: > On 07/12/23 16:03, Muchun Song wrote: > > > On Jul 12, 2023, at 06:09, Mike Kravetz wrote: > > > > > > Note that this will leave hugetlb pages in a state where they are marked > > > free (by hugetlb specific page flag) and have a ref count. This is not > > > a normal state. The only code that would notice is the memory error > > > code, and it is set up to retry in such a case. > > > > > > A subsequent patch will create a routine to do bulk processing of > > > vmemmap allocation. This will eliminate a lock/unlock cycle for each > > > hugetlb page in the case where we are freeing a large number of pages. > > > > > > Fixes: ad2fa3717b74 ("mm: hugetlb: alloc the vmemmap pages associated with each HugeTLB page") > > > Cc: > > > Signed-off-by: Mike Kravetz > > > > Hi Mike, > > > > I have seen an issue proposed by Jiaqi Yan in [1]. I didn't see any > > resolution for it. Am I missing something with this fix? > > > > [1] https://lore.kernel.org/linux-mm/CACw3F53iPiLrJt4pyaX2aaZ5BVg9tj8x_k6-v7=9Xn1nrh=UCw@mail.gmail.com/ > > > > My mistake! I sent the old version of the patch. > > The new version was modified to simply check the destructor via > folio_test_hugetlb() in order to decide if it should be cleared. > > I will send V2. Sorry! I was about to send v2 when I noticed that this approach opened another race window. :( Closing the window should be just a matter of reordering code. I will take a day or two to make sure I did not miss something else. -- Mike Kravetz