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From: "Alastair D'Silva" <alastair@au1.ibm.com>
To: alastair@d-silva.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	David Hildenbrand <david@redhat.com>,
	linux-kernel@vger.kernel.org, Nicholas Piggin <npiggin@gmail.com>,
	Paul Mackerras <paulus@samba.org>, Qian Cai <cai@lca.pw>,
	Thomas Gleixner <tglx@linutronix.de>,
	linuxppc-dev@lists.ozlabs.org,
	Andrew Morton <akpm@linux-foundation.org>,
	Allison Randal <allison@lohutok.net>
Subject: [PATCH v5 6/6] powerpc: Don't flush caches when adding memory
Date: Mon,  4 Nov 2019 13:32:58 +1100
Message-ID: <20191104023305.9581-7-alastair@au1.ibm.com> (raw)
In-Reply-To: <20191104023305.9581-1-alastair@au1.ibm.com>

From: Alastair D'Silva <alastair@d-silva.org>

This operation takes a significant amount of time when hotplugging
large amounts of memory (~50 seconds with 890GB of persistent memory).

This was orignally in commit fb5924fddf9e
("powerpc/mm: Flush cache on memory hot(un)plug") to support memtrace,
but the flush on add is not needed as it is flushed on remove.

Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
---
 arch/powerpc/mm/mem.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index a7b662fc02c8..4a424b514772 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -142,8 +142,6 @@ int __ref arch_add_memory(int nid, u64 start, u64 size,
 		return -EFAULT;
 	}
 
-	flush_dcache_range_chunked(start, start + size, FLUSH_CHUNK_SIZE);
-
 	return __add_pages(nid, start_pfn, nr_pages, restrictions);
 }
 
-- 
2.21.0


      parent reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-04  2:32 [PATCH v5 0/6] powerpc: convert cache asm to C Alastair D'Silva
2019-11-04  2:32 ` [PATCH v5 1/6] powerpc: Allow flush_icache_range to work across ranges >4GB Alastair D'Silva
2019-11-04 19:43   ` Segher Boessenkool
2019-11-05  6:04     ` Christophe Leroy
2019-11-06 17:49       ` Segher Boessenkool
2019-11-14  9:08   ` Michael Ellerman
2019-11-04  2:32 ` [PATCH v5 2/6] powerpc: Allow 64bit VDSO __kernel_sync_dicache " Alastair D'Silva
2019-11-04  2:32 ` [PATCH v5 3/6] powerpc: define helpers to get L1 icache sizes Alastair D'Silva
2019-11-04  2:32 ` [PATCH v5 4/6] powerpc: Convert flush_icache_range & friends to C Alastair D'Silva
2019-11-04  4:54   ` kbuild test robot
2019-11-12 10:49   ` Michael Ellerman
2019-11-04  2:32 ` [PATCH v5 5/6] powerpc: Chunk calls to flush_dcache_range in arch_*_memory Alastair D'Silva
2019-11-07 11:54   ` Michael Ellerman
2019-11-04  2:32 ` Alastair D'Silva [this message]

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