Hi, Le Sun, 27 Jul 2008 19:45:21 +0530, "Sandeep K Sinha" <sandeepksinha@xxxxxxxxx> a écrit : > The Issue that you discussed is clearly related to barriers, which are > used extensively in the linux kernel at most of the places as one of > the synchronization primitive. > I would suggest you reading more on read/write barriers. > You found find good explanation on the same in Linux Kernel > development by Rovert Love. I think you are making a confusion here between CPU/compiler barriers and I/O barriers. What you are talking about are CPU/compiler barriers, as described in Documentation/memory-barriers.txt. However, Paulo was probably referring to I/O barriers, as described in Documentation/block/barrier.txt. However, I'm not sure I understand Paulo's request properly. Issuing an I/O barrier is simply a matter of issuing a bio structure with the BIO_RW_BARRIER flag set in the bi_rw field of the bio structure. Sincerly, Thomas -- Thomas Petazzoni, Free Electrons Kernel, drivers and embedded Linux development, consulting, training and support. http://free-electrons.com
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