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==> Regarding Re: [patch rfc] towards supporting O_NONBLOCK on regular files; Pavel Machek <pavel@ucw.cz> adds: pavel> Hi! >> This patch makes an attempt at supporting the O_NONBLOCK flag for >> regular files. It's pretty straight-forward. One limitation is that we >> still call into the readahead code, which I believe can block. However, >> if we don't do this, then an application which only uses non-blocking >> reads may never get it's data. pavel> This looks very nice. Does it mean that aio and friends are pavel> instantly obsolete? I dont' think so. This only addresses the read() path, for one. Plus, in it's current form, it will not perform any I/O if the data is not present. So, you will need another thread/process to do kick off the I/O. pavel> Does it have comparable performance to aio? I haven't run any tests. One advantage this has to current aio is that it can operate without O_DIRECT. -Jeff - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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