"Luck, Tony" <tony.luck@xxxxxxxxx> writes: >> - add a per-user mutex, and do the usleep inside of it, so that >> anybody who tries to do a thousand threads will just be serialized by >> the mutex. >> >> Note that the mutex needs to be per-user, because otherwise it will be >> a DoS for the other users. > > I can try that tomorrow (adding the per-user mutex to struct user_struct > right next to the ratelimit I added. Another possibility is to cache the files in the page cache. That will reduce re-reads of the same data to the maximum extent. If efi has a chance of changing variables behind our back we might want something that would have a timeout on how long the data is cached, and we probably want to make the caching policy write-trough not write-back. I just suggest this as it seems like a much more tried and true solution. Eric -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
