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Date: Wed, 13 Aug 2014 03:56:26 -0700 From: tip-bot for Davidlohr Bueso <tipbot@...or.com> To: linux-tip-commits@...r.kernel.org Cc: linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org, torvalds@...ux-foundation.org, peterz@...radead.org, rdunlap@...radead.org, jason.low2@...com, tglx@...utronix.de, davidlohr@...com Subject: [tip:locking/core] locking/Documentation: Update locking/ mutex-design.txt disadvantages Commit-ID: 0a7cbf9abe3198461de3d3e97268db32a646ba06 Gitweb: http://git.kernel.org/tip/0a7cbf9abe3198461de3d3e97268db32a646ba06 Author: Davidlohr Bueso <davidlohr@...com> AuthorDate: Wed, 30 Jul 2014 13:41:56 -0700 Committer: Ingo Molnar <mingo@...nel.org> CommitDate: Wed, 13 Aug 2014 10:32:04 +0200 locking/Documentation: Update locking/mutex-design.txt disadvantages Fortunately Jason was able to reduce some of the overhead we had introduced in the original rwsem optimistic spinning - an it is now the same size as mutexes. Update the documentation accordingly. Signed-off-by: Davidlohr Bueso <davidlohr@...com> Acked-by: Jason Low <jason.low2@...com> Signed-off-by: Peter Zijlstra <peterz@...radead.org> Cc: aswin@...com Cc: Linus Torvalds <torvalds@...ux-foundation.org> Cc: Randy Dunlap <rdunlap@...radead.org> Link: http://lkml.kernel.org/r/1406752916-3341-7-git-send-email-davidlohr@hp.com Signed-off-by: Ingo Molnar <mingo@...nel.org> --- Documentation/locking/mutex-design.txt | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/Documentation/locking/mutex-design.txt b/Documentation/locking/mutex-design.txt index ee231ed..60c482d 100644 --- a/Documentation/locking/mutex-design.txt +++ b/Documentation/locking/mutex-design.txt @@ -145,9 +145,9 @@ Disadvantages Unlike its original design and purpose, 'struct mutex' is larger than most locks in the kernel. E.g: on x86-64 it is 40 bytes, almost twice -as large as 'struct semaphore' (24 bytes) and 8 bytes shy of the -'struct rw_semaphore' variant. Larger structure sizes mean more CPU -cache and memory footprint. +as large as 'struct semaphore' (24 bytes) and tied, along with rwsems, +for the largest lock in the kernel. Larger structure sizes mean more +CPU cache and memory footprint. When to use mutexes ------------------- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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