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owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 9/5/2025 12:58 PM, Luck, Tony wrote: >> So the issue is the result of inaccurate MCA record about per rank CE >> threshold being crossed. If OS offline the indicted page, it might be >> signaled to offline another 4K page in the same rank upon access. > > It appears that the BIOS that resulted in this report sensibly treats crossing > the rank error threshold as needing a one-time report via GHES. > >> Both MCA and offline-op are performance hitter, and as argued by this >> patch, offline doesn't help except loosing a already corrected page. >> >> Here we choose to bypass hugetlb page simply because it's huge. Is it >> possible to argue that because the page is huge, it's less likely to get >> another MCA on another page from the same rank? > > If there really is a problem with the rank, it likely affects most pages (or > at least most pages on the same NUMA node) because memory access > is (usually) interleaved between channels, and accesses within a 4K page > may hash to different ranks withing a channel. > >> A while back this patch >> 56374430c5dfc mm/memory-failure: userspace controls soft-offlining pages >> has provided userspace control over whether to soft offline, could it be >> a more preferable option? > > Thanks for pointing that one out. I'll feed that back to the original reporter > and see if it is an acceptable solution. > >> I don't know, the patch itself is fine, it's the issue that it has >> exposed that is more concerning. > > Agreed. The root problem is the BIOS using this threshold reporting > mechanism, without there being a way for the OS to determine the > scope of memory affected by the threshold. > > When this was originally implemented, the expectation was that the > scope would be a 4K page. Thanks! BTW, forgot to ask another question. ghes_do_proc bool sync = is_hest_sync_notify(ghes); [..] queued = ghes_handle_memory_failure(gdata, sev, sync); [..] if (sync && !queued) { force_sig(SIGBUS); The question is, in the CE MCE case, 'sync' is never 'true' by design, correct? thanks, -jane > > -Tony