The following commit has been merged into the ras/core branch of tip: Commit-ID: d25c6948a6aad787d9fd64de6b5362c3f23cc8d0 Gitweb: https://git.kernel.org/tip/d25c6948a6aad787d9fd64de6b5362c3f23cc8d0 Author: Tony Luck <tony.luck@xxxxxxxxx> AuthorDate: Tue, 02 Aug 2022 09:18:47 -07:00 Committer: Borislav Petkov <bp@xxxxxxx> CommitterDate: Mon, 22 Aug 2022 19:30:02 +02:00 RAS/CEC: Reduce offline page threshold for Intel systems A large scale study of memory errors on Intel systems in data centers showed that aggressively taking pages with corrected errors offline is the best strategy of using corrected errors as a predictor of future uncorrected errors. Set the threshold to "2" on Intel systems. AMD guidance is that this is not necessary for their systems. Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx> Signed-off-by: Borislav Petkov <bp@xxxxxxx> Reviewed-by: Yazen Ghannam <yazen.ghannam@xxxxxxx> Link: https://lore.kernel.org/r/20220607212015.175591-1-tony.luck@xxxxxxxxx Link: https://lore.kernel.org/r/YulOZ/Eso0bwUcC4@xxxxxxxxxxxxxxxxxxxxxxxxx --- drivers/ras/cec.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/ras/cec.c b/drivers/ras/cec.c index 42f2fc0..321af49 100644 --- a/drivers/ras/cec.c +++ b/drivers/ras/cec.c @@ -556,6 +556,14 @@ static int __init cec_init(void) if (ce_arr.disabled) return -ENODEV; + /* + * Intel systems may avoid uncorrectable errors + * if pages with corrected errors are aggressively + * taken offline. + */ + if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) + action_threshold = 2; + ce_arr.array = (void *)get_zeroed_page(GFP_KERNEL); if (!ce_arr.array) { pr_err("Error allocating CE array page!\n");
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