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  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]
Date:   Tue, 29 Dec 2020 10:10:34 +0900
From:   Joonsoo Kim <>
To:     Jann Horn <>
Cc:     Christoph Lameter <>,
        Pekka Enberg <>,
        David Rientjes <>,
        Joonsoo Kim <>,
        Andrew Morton <>,
        Linux Memory Management List <>,
        LKML <>
Subject: Re: [PATCH] mm, slub: Consider rest of partial list if acquire_slab() fails

2020년 12월 28일 (월) 오후 10:10, Jann Horn <>님이 작성:
> acquire_slab() fails if there is contention on the freelist of the page
> (probably because some other CPU is concurrently freeing an object from the
> page). In that case, it might make sense to look for a different page
> (since there might be more remote frees to the page from other CPUs, and we
> don't want contention on struct page).
> However, the current code accidentally stops looking at the partial list
> completely in that case. Especially on kernels without CONFIG_NUMA set,
> this means that get_partial() fails and new_slab_objects() falls back to
> new_slab(), allocating new pages. This could lead to an unnecessary
> increase in memory fragmentation.
> Fixes: 7ced37197196 ("slub: Acquire_slab() avoid loop")
> Signed-off-by: Jann Horn <>

Acked-by: Joonsoo Kim <>


Powered by blists - more mailing lists