On Thu, Jan 07, 2021 at 10:47:07AM -0800, Linus Torvalds wrote: > Now, the "whole entry" is just 8 bytes, so it's possible that it would > actually be faster to do a copy of the whole thing rather than write > just the 16 bits. But I got very nervous about it, because I could > easily see some threaded app actually changing the 'fd' (or the > 'event' field) in place (ie writing -1 to it as they close and re-use > it)
BTW, changing 'event' field in place from another thread is going to be interesting - you have two 16bit values next to each other and two CPUs modifying those with no exclusion. Sounds like a recipe for massive trouble... Or am I missing something here?
