3 Commits

Author	SHA1	Message	Date
Dennis Zhou	303abfdf76	percpu: fix early calls for spinlock in pcpu_stats ... From 2c06e795162cb306c9707ec51d3e1deadb37f573 Mon Sep 17 00:00:00 2001 From: Dennis Zhou <dennisz@fb.com> Date: Wed, 21 Jun 2017 10:17:09 -0700 Commit 30a5b5367e ("percpu: expose statistics about percpu memory via debugfs") introduces percpu memory statistics. pcpu_stats_chunk_alloc takes the spin lock and disables/enables irqs on creation of a chunk. Irqs are not enabled when the first chunk is initialized and thus kernels are failing to boot with kernel debugging enabled. Fixed by changing _irq to _irqsave and _irqrestore. Fixes: 30a5b5367e ("percpu: expose statistics about percpu memory via debugfs") Signed-off-by: Dennis Zhou <dennisz@fb.com> Reported-by: Alexander Levin <alexander.levin@verizon.com> Signed-off-by: Tejun Heo <tj@kernel.org>	2017-06-21 13:53:52 -04:00
Dennis Zhou	30a5b5367e	percpu: expose statistics about percpu memory via debugfs ... There is limited visibility into the use of percpu memory leaving us unable to reason about correctness of parameters and overall use of percpu memory. These counters and statistics aim to help understand basic statistics about percpu memory such as number of allocations over the lifetime, allocation sizes, and fragmentation. New Config: PERCPU_STATS Signed-off-by: Dennis Zhou <dennisz@fb.com> Signed-off-by: Tejun Heo <tj@kernel.org>	2017-06-20 15:31:38 -04:00
Dennis Zhou	8fa3ed8014	percpu: migrate percpu data structures to internal header ... Migrates pcpu_chunk definition and a few percpu static variables to an internal header file from mm/percpu.c. These will be used with debugfs to expose statistics about percpu memory improving visibility regarding allocations and fragmentation. Signed-off-by: Dennis Zhou <dennisz@fb.com> Signed-off-by: Tejun Heo <tj@kernel.org>	2017-06-20 15:31:28 -04:00