This is a note to let you know that I've just added the patch titled
powerpc/pseries: explicitly reschedule during drmem_lmb list traversal
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-pseries-explicitly-reschedule-during-drmem_l.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 3dd18ef7e212c25032b5074263d13a35d3012deb
Author: Nathan Lynch <nathanl@xxxxxxxxxxxxx>
Date: Thu Aug 13 10:11:31 2020 -0500
powerpc/pseries: explicitly reschedule during drmem_lmb list traversal
[ Upstream commit 9d6792ffe140240ae54c881cc4183f9acc24b4df ]
The drmem lmb list can have hundreds of thousands of entries, and
unfortunately lookups take the form of linear searches. As long as
this is the case, traversals have the potential to monopolize the CPU
and provoke lockup reports, workqueue stalls, and the like unless
they explicitly yield.
Rather than placing cond_resched() calls within various
for_each_drmem_lmb() loop blocks in the code, put it in the iteration
expression of the loop macro itself so users can't omit it.
Introduce a drmem_lmb_next() iteration helper function which calls
cond_resched() at a regular interval during array traversal. Each
iteration of the loop in DLPAR code paths can involve around ten RTAS
calls which can each take up to 250us, so this ensures the check is
performed at worst every few milliseconds.
Fixes: 6c6ea53725b3 ("powerpc/mm: Separate ibm, dynamic-memory data from DT format")
Signed-off-by: Nathan Lynch <nathanl@xxxxxxxxxxxxx>
Reviewed-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20200813151131.2070161-1-nathanl@xxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/powerpc/include/asm/drmem.h b/arch/powerpc/include/asm/drmem.h
index 9e516fe3daaba..668d8a121f1a0 100644
--- a/arch/powerpc/include/asm/drmem.h
+++ b/arch/powerpc/include/asm/drmem.h
@@ -12,6 +12,8 @@
#ifndef _ASM_POWERPC_LMB_H
#define _ASM_POWERPC_LMB_H
+#include <linux/sched.h>
+
struct drmem_lmb {
u64 base_addr;
u32 drc_index;
@@ -27,8 +29,22 @@ struct drmem_lmb_info {
extern struct drmem_lmb_info *drmem_info;
+static inline struct drmem_lmb *drmem_lmb_next(struct drmem_lmb *lmb,
+ const struct drmem_lmb *start)
+{
+ /*
+ * DLPAR code paths can take several milliseconds per element
+ * when interacting with firmware. Ensure that we don't
+ * unfairly monopolize the CPU.
+ */
+ if (((++lmb - start) % 16) == 0)
+ cond_resched();
+
+ return lmb;
+}
+
#define for_each_drmem_lmb_in_range(lmb, start, end) \
- for ((lmb) = (start); (lmb) < (end); (lmb)++)
+ for ((lmb) = (start); (lmb) < (end); lmb = drmem_lmb_next(lmb, start))
#define for_each_drmem_lmb(lmb) \
for_each_drmem_lmb_in_range((lmb), \
