[Bug 222356] www/firefox: file-backed shared memory performance

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222356

--- Comment #5 from Konstantin Belousov <kib at FreeBSD.org> ---
(In reply to Tijl Coosemans from comment #4)
+J should make the amount of writes on close significantly larger.  +J solves
the problem of leaked resources only, since the problem of the filesystem
metadata correctness is already solved by the SU part.  So +J must journal all
metadata objects which cannot be reached from the normal metadata accesses.  In
particular, all freed data blocks must be mentioned in the journal records
before cg bitmaps are allowed to be written.

The result is that +J at least doubles the amount of writes, and also the data
amount is O(file length) at least.

Again, your description does not make me see how my patch (which only affects
msync(2)) relates to the build failures.

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