Greg & Sasha,
can you please queue-up this upstream patch for kernel v6.5-stable ?
commit 3cec50490969afd4a76ccee441f747d869ccff77 Author: Linus Torvalds torvalds@linux-foundation.org Date: Sat Sep 16 12:31:42 2023 -0700
vm: fix move_vma() memory accounting being off
Thanks, Helge
On 9/16/23 23:17, Linus Torvalds wrote:
On Sat, 16 Sept 2023 at 12:31, Linus Torvalds torvalds@linux-foundation.org wrote:
Does the attached patch fix the problem?
So while I didn't confirm the fix myself, I'm pretty sure that was it. Getting the return value wrong would cause an incorrect extra vm_acct_memory() call in the non-error case when VM_ACCOUNT is set (and mean the loss of one in the error case, but the error case never happens in practice).
Which then causes 'vm_committed_as' to grow when it shouldn't, and causes exactly that "Committed_AS" in /proc/meminfo to be off.
So here's the same patch, but now with a proper commit message etc.
I haven't pushed it out (because it would be lovely to get a "Tested-by" for it, and that will make the commit ID change), but I'll probably do so later today, with or without confirmation, because it does seem to be the problem.
Linus