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bh=cW3MjXVX2BntOHHLPXhbYtN56L01c+6vPIBLotyGlpk=; b=EoEFg0t1ekgBvYPHxyCsFqhpRjXmAMTwAd0m6x9VyvIN4f3OstEnbqiv2nF+TuJpUPBzMF fl09jf+I7SX+jhC5BSSK+ufFbRSmfulou6SoskAk1+Nz0XwzVSPLYN90ZGdJyNzzGeyAD0 K0s6pTtq6hcFEKo9Yy/XFe2ep2eP6OQ= X-Rspam-User: X-Stat-Signature: gx4he36muequd3fxpu6prgar8dn9rpcj X-Rspamd-Queue-Id: 62DADA0136 Authentication-Results: imf25.hostedemail.com; dkim=none ("invalid DKIM record") header.d=intel.com header.s=Intel header.b=YazGY1Fh; spf=pass (imf25.hostedemail.com: domain of fengwei.yin@intel.com designates 134.134.136.31 as permitted sender) smtp.mailfrom=fengwei.yin@intel.com; arc=reject ("signature check failed: fail, {[1] = sig:microsoft.com:reject}"); dmarc=pass (policy=none) header.from=intel.com X-Rspamd-Server: rspam02 X-HE-Tag: 1659535875-939809 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Hi Dave, On 8/3/2022 9:02 AM, Dave Chinner wrote: > That a single cacheline miss avoids all the spinlock contention is > just pure luck - it'll come back if other work is being done on the > machine that consumes enough memory bandwidth to push this back over > the edge. Agree. We did see some strange performance boost which can't be connected to the code change. And worried later unrelated change reduce the mysterious performance gain (and report it as regression). Regards Yin, Fengwei