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From: Marcelo Tosatti <mtosatti@redhat.com>
To: Christoph Lameter <cl@linux.com>
Cc: Aaron Tomlin <atomlin@atomlin.com>,
	Frederic Weisbecker <frederic@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	Russell King <linux@armlinux.org.uk>,
	Huacai Chen <chenhuacai@kernel.org>,
	Heiko Carstens <hca@linux.ibm.com>,
	x86@kernel.org, Vlastimil Babka <vbabka@suse.cz>,
	Michal Hocko <mhocko@suse.com>,
	Marcelo Tosatti <mtosatti@redhat.com>
Subject: [PATCH v7 02/13] this_cpu_cmpxchg: ARM64: switch this_cpu_cmpxchg to locked, add _local function
Date: Mon, 20 Mar 2023 15:03:34 -0300	[thread overview]
Message-ID: <20230320180745.582248645@redhat.com> (raw)
In-Reply-To: 20230320180332.102837832@redhat.com

Goal is to have vmstat_shepherd to transfer from
per-CPU counters to global counters remotely. For this, 
an atomic this_cpu_cmpxchg is necessary.

Following the kernel convention for cmpxchg/cmpxchg_local,
change ARM's this_cpu_cmpxchg_ helpers to be atomic,
and add this_cpu_cmpxchg_local_ helpers which are not atomic.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

---

Index: linux-vmstat-remote/arch/arm64/include/asm/percpu.h
===================================================================
--- linux-vmstat-remote.orig/arch/arm64/include/asm/percpu.h
+++ linux-vmstat-remote/arch/arm64/include/asm/percpu.h
@@ -232,13 +232,23 @@ PERCPU_RET_OP(add, add, ldadd)
 	_pcp_protect_return(xchg_relaxed, pcp, val)
 
 #define this_cpu_cmpxchg_1(pcp, o, n)	\
-	_pcp_protect_return(cmpxchg_relaxed, pcp, o, n)
+	_pcp_protect_return(cmpxchg, pcp, o, n)
 #define this_cpu_cmpxchg_2(pcp, o, n)	\
-	_pcp_protect_return(cmpxchg_relaxed, pcp, o, n)
+	_pcp_protect_return(cmpxchg, pcp, o, n)
 #define this_cpu_cmpxchg_4(pcp, o, n)	\
-	_pcp_protect_return(cmpxchg_relaxed, pcp, o, n)
+	_pcp_protect_return(cmpxchg, pcp, o, n)
 #define this_cpu_cmpxchg_8(pcp, o, n)	\
+	_pcp_protect_return(cmpxchg, pcp, o, n)
+
+#define this_cpu_cmpxchg_local_1(pcp, o, n)	\
 	_pcp_protect_return(cmpxchg_relaxed, pcp, o, n)
+#define this_cpu_cmpxchg_local_2(pcp, o, n)	\
+	_pcp_protect_return(cmpxchg_relaxed, pcp, o, n)
+#define this_cpu_cmpxchg_local_4(pcp, o, n)	\
+	_pcp_protect_return(cmpxchg_relaxed, pcp, o, n)
+#define this_cpu_cmpxchg_local_8(pcp, o, n)	\
+	_pcp_protect_return(cmpxchg_relaxed, pcp, o, n)
+
 
 #ifdef __KVM_NVHE_HYPERVISOR__
 extern unsigned long __hyp_per_cpu_offset(unsigned int cpu);



  parent reply	other threads:[~2023-03-20 18:20 UTC|newest]

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-03-20 18:03 [PATCH v7 00/13] fold per-CPU vmstats remotely Marcelo Tosatti
2023-03-20 18:03 ` [PATCH v7 01/13] vmstat: allow_direct_reclaim should use zone_page_state_snapshot Marcelo Tosatti
2023-03-20 18:21   ` Michal Hocko
2023-03-20 18:32     ` Marcelo Tosatti
2023-03-22 10:03       ` Michal Hocko
2023-03-20 18:03 ` Marcelo Tosatti [this message]
2023-03-20 18:03 ` [PATCH v7 03/13] this_cpu_cmpxchg: loongarch: switch this_cpu_cmpxchg to locked, add _local function Marcelo Tosatti
2023-03-20 18:03 ` [PATCH v7 04/13] this_cpu_cmpxchg: S390: " Marcelo Tosatti
2023-03-20 18:03 ` [PATCH v7 05/13] this_cpu_cmpxchg: x86: " Marcelo Tosatti
2023-03-20 18:03 ` [PATCH v7 06/13] add this_cpu_cmpxchg_local and asm-generic definitions Marcelo Tosatti
2023-03-20 18:03 ` [PATCH v7 07/13] convert this_cpu_cmpxchg users to this_cpu_cmpxchg_local Marcelo Tosatti
2023-03-20 18:03 ` [PATCH v7 08/13] mm/vmstat: switch counter modification to cmpxchg Marcelo Tosatti
2023-03-20 18:03 ` [PATCH v7 09/13] vmstat: switch per-cpu vmstat counters to 32-bits Marcelo Tosatti
2023-03-20 18:03 ` [PATCH v7 10/13] mm/vmstat: use xchg in cpu_vm_stats_fold Marcelo Tosatti
2023-03-20 18:03 ` [PATCH v7 11/13] mm/vmstat: switch vmstat shepherd to flush per-CPU counters remotely Marcelo Tosatti
2023-03-20 18:03 ` [PATCH v7 12/13] mm/vmstat: refresh stats remotely instead of via work item Marcelo Tosatti
2023-03-20 18:03 ` [PATCH v7 13/13] vmstat: add pcp remote node draining via cpu_vm_stats_fold Marcelo Tosatti
2023-03-20 20:43   ` Tim Chen
2023-03-22  1:20     ` Marcelo Tosatti
2023-03-20 18:25 ` [PATCH v7 00/13] fold per-CPU vmstats remotely Michal Hocko
2023-03-20 19:07   ` Marcelo Tosatti
2023-03-22 10:13     ` Michal Hocko
2023-03-22 11:23       ` Marcelo Tosatti
2023-03-22 13:35         ` Michal Hocko
2023-03-22 14:20           ` Marcelo Tosatti
2023-03-23  7:51             ` Michal Hocko
2023-03-23 10:52               ` Marcelo Tosatti
2023-03-23 10:59                 ` Marcelo Tosatti
2023-03-23 12:17                 ` Michal Hocko
2023-03-23 13:30                   ` Marcelo Tosatti
2023-03-23 13:32                     ` Marcelo Tosatti
2023-04-18 22:02 ` Andrew Morton
2023-04-19 11:14   ` Marcelo Tosatti
2023-04-19 11:15     ` Marcelo Tosatti
2023-04-19 13:44       ` Andrew Theurer
2023-04-20  7:55         ` Michal Hocko
2023-04-23  1:25           ` Marcelo Tosatti
2023-04-19 11:29     ` Marcelo Tosatti
2023-04-19 11:59       ` Marcelo Tosatti
2023-04-19 12:24         ` Frederic Weisbecker
2023-04-19 13:48           ` Marcelo Tosatti
2023-04-19 14:35             ` Michal Hocko
2023-04-19 16:35               ` Marcelo Tosatti
2023-04-20  8:40                 ` Michal Hocko
2023-04-23  1:10                   ` Marcelo Tosatti
2023-04-20 13:45                 ` Marcelo Tosatti
2023-04-26 14:34                   ` Marcelo Tosatti
2023-04-27  8:31                     ` Michal Hocko
2023-04-27 14:59                       ` Marcelo Tosatti
2023-04-26 15:04                   ` Vlastimil Babka
2023-04-26 16:10                     ` Marcelo Tosatti
2023-04-27  8:39                       ` Michal Hocko
2023-04-27 16:25                         ` Marcelo Tosatti
2023-04-19 16:47       ` Vlastimil Babka
2023-04-19 19:15         ` Marcelo Tosatti
2023-05-03 13:51           ` Marcelo Tosatti

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