[LU-8451] assert if cpu_pattern specifies exactly one cpu in the partition

• Status: Resolved
• Project: Lustre
• Type: Bug
• Priority: Minor
• Reporter: Amir Shehata (Inactive)
• Assignee: Amir Shehata (Inactive)
• Resolution: Duplicate
• Severity: 3

Description

cpu_pattern can sepcify exactly 1 cpu in a partition:
"0[0]". That means CPT0 will have CPU 0. CPU 0 can have
hyperthreading enabled. This combination would result in
weight = cfs_cpu_ht_nsiblings(0);
hrp->hrp_nthrs = cfs_cpt_weight(ptlrpc_hr.hr_cpt_table, i);
hrp->hrp_nthrs /= weight;
evaluating to 0

Causing LASSERT(hrp->hrp_nthrs > 0); to trigger

Patch
http://review.whamcloud.com/#/c/19106/

attempts to resolve this issue.

Issue Links

• is related to: LU-8492 ptlrpc: Correctly calculate hrp->hrp_...

Comments

[Joseph Gmitter (Inactive)]

Hi Amir,

Can you please review Oleg's comments in the patch?

Thanks.
Joe