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futex.2: Remove detail about kernel internals 

As commented on by Davidlohr Bueso:

    This to me reads a bit too much into the kernel (fastpath,
    refcnt, vmas). Why not just mention that it avoids overhead
    in the kernel or something? I don't recall any manpage
    mentioning such details, but I could be wrong.

Reported-by: Davidlohr Bueso <dave@stgolabs.net>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2015-07-27 12:49:56 +02:00
parent 10022b8e63
commit 943ccc5228
1 changed files with 4 additions and 3 deletions
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7
man2/futex.2
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@ -175,9 +175,10 @@ This option bit can be employed with all futex operations.
It tells the kernel that the futex is process-private and not shared
with another process (i.e., it is being used for synchronization
only between threads of the same process).
This allows the kernel to choose the fast path for validating
the user-space address and avoids expensive VMA lookups,
taking reference counts on file backing store, and so on.
This allows the kernel to make some additional performance optimizations.
.\" I.e., It allows the kernel choose the fast path for validating
.\" the user-space address and avoids expensive VMA lookups,
.\" taking reference counts on file backing store, and so on.
As a convenience,
.IR <linux/futex.h>