Date: Thu, 10 Jan 2019 11:00:04 +0000 From: bugzilla-noreply@freebsd.org To: emulation@FreeBSD.org Subject: [Bug 230160] linuxulator doesn't implement madvise(MADV_DONTNEED) and any MADV_ flags with values >= 8 correctly Message-ID: <bug-230160-4077-0GUPjf94dr@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-230160-4077@https.bugs.freebsd.org/bugzilla/> References: <bug-230160-4077@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230160 David Chisnall <theraven@FreeBSD.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Summary|linuxulator doesn't |linuxulator doesn't |implement |implement |madvise(MADV_DONTNEED) |madvise(MADV_DONTNEED) and |correctly |any MADV_ flags with values | |>= 8 correctly --- Comment #3 from David Chisnall <theraven@FreeBSD.org> --- (In reply to Mark Johnston from comment #2) Sorry, wanting MADV_ZERO is an unrelated issue: we have some code that would get a very nice perf improvement if we had it. In our own code, we implement a FreeBSD equivalent of Linux's MADV_DONTNEED by doing an mmap with MAP_FIXED over the address range. This works fine for anonymous memory mappings (which is all that Linux supports), but it means that we have to fall back to bzero for shared memory (which means that, among other things, we get a unique physical page for each virtual page, even though there's a good chance that the pages are going to stay zero for a while). -- You are receiving this mail because: You are the assignee for the bug.
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