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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@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Yazen Ghannam <yazen.ghannam@amd.com>
Link: https://lore.kernel.org/r/20220607212015.175591-1-tony.luck@intel.com
Link: https://lore.kernel.org/r/YulOZ/Eso0bwUcC4@agluck-desk3.sc.intel.com
This commit is contained in:
Tony Luck 2022-08-02 09:18:47 -07:00 committed by Borislav Petkov
parent 1c23f9e627
commit d25c6948a6
1 changed files with 8 additions and 0 deletions
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8
drivers/ras/cec.c
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@ -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");