From: "Ulrich Drepper" <drepper@gmail.com>
To: Eric Dumazet <dada1@cosmosbay.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
Nick Piggin <nickpiggin@yahoo.com.au>,
Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 0/4] futex: get_user_pages_fast() for shared futexes
Date: Tue, 30 Sep 2008 20:13:44 -0700 [thread overview]
Message-ID: <a36005b50809302013w54db0985o635bcbef05a9e8f3@mail.gmail.com> (raw)
In-Reply-To: <48E205BE.8030908@cosmosbay.com>
On Tue, Sep 30, 2008 at 3:55 AM, Eric Dumazet <dada1@cosmosbay.com> wrote:
> I am not sure how it could be converted to private futexes, since
> old binaries (static glibc) will use FUTEX_WAKE like calls.
We considered this back when but any effort seems too much. We'd
either need a clone flag (a scarce resource) or replace the set_tid
_address syscall. Given that the futex is woken once per thread
lifetime it shouldn't be an issue. If the semaphore shows up even
after this patch feel free to introduce a new set_tid_address syscall.
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next prev parent reply other threads:[~2008-10-01 3:13 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-26 17:32 Peter Zijlstra
2008-09-26 17:32 ` [PATCH 1/4] futex: rely on get_user_pages() " Peter Zijlstra
2008-09-26 17:32 ` [PATCH 2/4] futex: reduce mmap_sem usage Peter Zijlstra
2008-09-26 17:32 ` [PATCH 3/4] futex: use fast_gup() Peter Zijlstra
2008-09-26 17:32 ` [PATCH 4/4] futex: cleanup fshared Peter Zijlstra
2008-09-27 16:17 ` [PATCH 0/4] futex: get_user_pages_fast() for shared futexes Ingo Molnar
2008-09-30 7:21 ` Nick Piggin
2008-09-30 8:51 ` Peter Zijlstra
2008-09-30 10:39 ` Ingo Molnar
2008-09-30 10:42 ` Nick Piggin
2008-09-30 10:55 ` Eric Dumazet
2008-09-30 11:16 ` Peter Zijlstra
2008-10-01 3:13 ` Ulrich Drepper [this message]
2008-09-30 10:39 ` Ingo Molnar
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