Messages in this thread | | | Date | Thu, 30 Aug 2007 03:57:07 +0530 | From | Balbir Singh <> | Subject | Re: [-mm PATCH] Memory controller improve user interface |
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Dave Hansen wrote: > On Thu, 2007-08-30 at 03:34 +0530, Balbir Singh wrote: >> I've thought about this before. The problem is that a user could >> set his limit to 10000 bytes, but would then see the usage and >> limit round to the closest page boundary. This can be confusing >> to a user. > > True, but we're lying if we allow a user to set their limit there, > because we can't actually enforce a limit at 8,192 bytes vs 10,000. > They're the same limit as far as the kernel is concerned. > > Why not just -EINVAL if the value isn't page-aligned? There are plenty > of interfaces in the kernel that require userspace to know the page > size, so this shouldn't be too difficult.
True, mmap() is a good example of such an interface for developers, I am not sure about system admins though.
To quote Andrew <quote> Reporting tools could run getpagesize() and do the arithmetic, but we generally try to avoid exposing PAGE_SIZE, HZ, etc to userspace in this manner. </quote>
-- Warm Regards, Balbir Singh Linux Technology Center IBM, ISTL - 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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