lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Message-ID: <813b1141-4050-ead7-ec52-a2b3b8e26fee@126.com>
Date: Mon, 17 Jun 2024 19:22:59 +0800
From: yangge1116 <yangge1116@....com>
To: David Hildenbrand <david@...hat.com>, Matthew Wilcox <willy@...radead.org>
Cc: Baolin Wang <baolin.wang@...ux.alibaba.com>, 21cnbao@...il.com,
 akpm@...ux-foundation.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
 liuzixing@...on.cn
Subject: Re: [PATCH] mm/gup: don't check page lru flag before draining it



在 2024/6/17 下午5:52, David Hildenbrand 写道:
> Why would we want to make folio_maybe_dma_pinned() detection that worse

Just want to fix it using the existing function, seems a little 
unreasonable. I will prepare the V2 using folio_test_lru(folio) to check.

static unsigned long collect_longterm_unpinnable_pages(...)
{
...
     if (!folio_test_lru(folio) && drain_allow) {
         lru_add_drain_all();
         drain_allow = false;
     }
...
}

void folio_mark_lazyfree(struct folio *folio)
{
     if (folio_test_anon(folio) && folio_test_swapbacked(folio) &&
        !folio_test_swapcache(folio) && !folio_test_unevictable(folio)) {
         struct folio_batch *fbatch;

         folio_get(folio);
         if (!folio_test_clear_lru(folio)) {
             folio_put(folio);
             return;
         }

         local_lock(&cpu_fbatches.lock);
         fbatch = this_cpu_ptr(&cpu_fbatches.lru_lazyfree);
         folio_batch_add_and_move(fbatch, folio, lru_lazyfree_fn);
         local_unlock(&cpu_fbatches.lock);
     }
}


Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ