[kernel-bugs] [Bug 1159882] Excessive swapping when buffers / cache expand beyond free physical RAM
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https://bugzilla.suse.com/show_bug.cgi?id=1159882 https://bugzilla.suse.com/show_bug.cgi?id=1159882#c42 --- Comment #42 from Vlastimil Babka <vbabka@suse.com> --- (In reply to Michal Hocko from comment #41)
Vlastimil, I remember we have discussed this problem in upstream some time ago. You've had a patch which has disabled the heuristic (2c012a4ad1a2). Testing with that reverted would sound like a good next step.
I think the past discussion was about us *not* having 2c012a4ad1a2 (in an older kernel) as the problem was different - file pages thrashing while unused anonymous pages sit idly. See https://lore.kernel.org/linux-mm/b7f5e356-1f0a-98be-4a32-09a766c3949b@suse.c... Anyway, what is the actual observed issue here? Is it that part of the swap gets used? I think Michal's analysis in comment 33 shows the swapped out pages are not accessed (no increase in pswpin) so it shouldn't actually cause excessive IO. So is it only that the swap being used looks bad? If there's really observed performance issue (e.g. system being sluggish) while doing the operations listed in comment 23, does disabling swap completely make any difference? If not, we might be looking at a red flag here, IMHO. -- You are receiving this mail because: You are the assignee for the bug.
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