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Re: Linux 4.9-rc6

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On Sun, 2016-11-20 at 14:05 -0800, Linus Torvalds wrote:

> That said, nothing particular is bothering me all that much, but we've
> had some of the VMALLOC_STACK fixups continue to trickle in, so I
> worry that we're not quite done there yet. And let's see what
> Thorsten's regression list looks like next week. So no decision yet,
> it could still go either way.

Hosts with ~100,000 threads have an issue with /prov/vmallocinfo

It can take about 800 usec to skip over ~100,000 struct vmap_area
in s_start(), while holding vmap_area_lock spinlock, and therefore
blocking fork()/pthread_create().

I presume we can not switch to the rbtree (vmap_area_root)
for /proc/vmallocinfo, because this file is seek-able, right ?

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Linux 4.9-rc6 Linus Torvalds <torvalds@linux-foundation.org> - 2016-11-20 23:10 +0100
  Re: Linux 4.9-rc6 Eric Dumazet <eric.dumazet@gmail.com> - 2016-11-20 23:40 +0100
    Re: Linux 4.9-rc6 Linus Torvalds <torvalds@linux-foundation.org> - 2016-11-21 00:30 +0100
      Re: Linux 4.9-rc6 Al Viro <viro@ZenIV.linux.org.uk> - 2016-11-21 02:40 +0100
        Re: Linux 4.9-rc6 Eric Dumazet <eric.dumazet@gmail.com> - 2016-11-21 06:00 +0100
          Re: Linux 4.9-rc6 David Rientjes <rientjes@google.com> - 2016-11-21 09:40 +0100
            Re: Linux 4.9-rc6 Eric Dumazet <eric.dumazet@gmail.com> - 2016-11-21 14:40 +0100
              Re: Linux 4.9-rc6 Eric Dumazet <eric.dumazet@gmail.com> - 2016-11-21 15:00 +0100
                Re: Linux 4.9-rc6 Eric Dumazet <eric.dumazet@gmail.com> - 2016-11-21 17:50 +0100

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