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Subject[PATCH v2] 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.

Reviewed-by: Yazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
---

V2:
Fix some spelling errors.
Add note to commit that AMD systems do not need this.
Add Yazen's Reviewed-by tag.

drivers/ras/cec.c | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/drivers/ras/cec.c b/drivers/ras/cec.c
index 42f2fc0bc8a9..321af498ee11 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");
--
2.35.3
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