Andrew Morton wrote:
The man page on my system says:
unsigned short mode; /* Permissions + SHM_DEST and
SHM_LOCKED flags */
I looked for a precendent before sending the patch and thought that
SHM_LOCKED was a good one.
hm, OK. But an app could still do
if (mode == 0666|SHM_LOCKED)
I'd argue that the app should really be doing (perm.mode & 0777 = 0666)
How important is this feature?
Without this feature, an application has no way to figure out if a given
segment is hugetlb or not. Applications need to know this to be able to
handle alignment issues properly.
Also, if the flag is exported via ipcs, the system administrator would
have a better idea about how the hugetlb pages she configured on the
system are getting used.
-Arun
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