Messages in this thread | | | Date | Sun, 29 Dec 2002 16:24:52 +0100 | From | Erik Mouw <> | Subject | Re: Reading a file in the driver |
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On Fri, Dec 27, 2002 at 10:13:32AM -0500, David Anderson wrote: > I am reading some data from a file byte by byte in my driver. Although it's not a good thing to read a file in the driver I have to do it. My file is quite big can contain about 1000 lines each line containing anywhere from 0 to 500 characters. I believe carry out 500000 reads is not a good thing. > > Any suggestions on how I can improve ??
Sure, do it from userland. Make a device node to which userland can write the file you want. This nicely removes the policy problem of *which* file to read from *what* location and puts it were it belongs: userland. With this setup you can even read files from such exotic locations like other servers or SQL databases.
If the driver needs to initiate the file reading, just startup a userland helper that does the reads for you. See for example how the hotplug subsystem calls /sbin/hotplug.
Erik
-- J.A.K. (Erik) Mouw J.A.K.Mouw@its.tudelft.nl mouw@nl.linux.org http://www-ict.its.tudelft.nl/~erik/ - 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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