From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: linux-kernel@vger.kernel.org
Cc: rt@linutronix.de, tglx@linutronix.de,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Seth Jennings <sjenning@redhat.com>,
linux-mm@kvack.org
Subject: [PATCH 11/22] mm/zswap: Convert dst-mem to hotplug state machine
Date: Sun, 27 Nov 2016 00:13:39 +0100 [thread overview]
Message-ID: <20161126231350.10321-12-bigeasy@linutronix.de> (raw)
In-Reply-To: <20161126231350.10321-1-bigeasy@linutronix.de>
Install the callbacks via the state machine and let the core invoke
the callbacks on the already online CPUs.
Cc: Seth Jennings <sjenning@redhat.com>
Cc: linux-mm@kvack.org
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
include/linux/cpuhotplug.h | 1 +
mm/zswap.c | 75 +++++++++++-----------------------------------
2 files changed, 19 insertions(+), 57 deletions(-)
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index 9f29dd996088..62f51a4e8676 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -65,6 +65,7 @@ enum cpuhp_state {
CPUHP_ARM_BL_PREPARE,
CPUHP_TRACE_RB_PREPARE,
CPUHP_MM_ZS_PREPARE,
+ CPUHP_MM_ZSWP_MEM_PREPARE,
CPUHP_TIMERS_DEAD,
CPUHP_NOTF_ERR_INJ_PREPARE,
CPUHP_MIPS_SOC_PREPARE,
diff --git a/mm/zswap.c b/mm/zswap.c
index 275b22cc8df4..b13aa5706348 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -352,70 +352,28 @@ static struct zswap_entry *zswap_entry_find_get(struct rb_root *root,
**********************************/
static DEFINE_PER_CPU(u8 *, zswap_dstmem);
-static int __zswap_cpu_dstmem_notifier(unsigned long action, unsigned long cpu)
+static int zswap_dstmem_prepare(unsigned int cpu)
{
u8 *dst;
- switch (action) {
- case CPU_UP_PREPARE:
- dst = kmalloc_node(PAGE_SIZE * 2, GFP_KERNEL, cpu_to_node(cpu));
- if (!dst) {
- pr_err("can't allocate compressor buffer\n");
- return NOTIFY_BAD;
- }
- per_cpu(zswap_dstmem, cpu) = dst;
- break;
- case CPU_DEAD:
- case CPU_UP_CANCELED:
- dst = per_cpu(zswap_dstmem, cpu);
- kfree(dst);
- per_cpu(zswap_dstmem, cpu) = NULL;
- break;
- default:
- break;
+ dst = kmalloc_node(PAGE_SIZE * 2, GFP_KERNEL, cpu_to_node(cpu));
+ if (!dst) {
+ pr_err("can't allocate compressor buffer\n");
+ return -ENOMEM;
}
- return NOTIFY_OK;
-}
-
-static int zswap_cpu_dstmem_notifier(struct notifier_block *nb,
- unsigned long action, void *pcpu)
-{
- return __zswap_cpu_dstmem_notifier(action, (unsigned long)pcpu);
-}
-
-static struct notifier_block zswap_dstmem_notifier = {
- .notifier_call = zswap_cpu_dstmem_notifier,
-};
-
-static int __init zswap_cpu_dstmem_init(void)
-{
- unsigned long cpu;
-
- cpu_notifier_register_begin();
- for_each_online_cpu(cpu)
- if (__zswap_cpu_dstmem_notifier(CPU_UP_PREPARE, cpu) ==
- NOTIFY_BAD)
- goto cleanup;
- __register_cpu_notifier(&zswap_dstmem_notifier);
- cpu_notifier_register_done();
+ per_cpu(zswap_dstmem, cpu) = dst;
return 0;
-
-cleanup:
- for_each_online_cpu(cpu)
- __zswap_cpu_dstmem_notifier(CPU_UP_CANCELED, cpu);
- cpu_notifier_register_done();
- return -ENOMEM;
}
-static void zswap_cpu_dstmem_destroy(void)
+static int zswap_dstmem_dead(unsigned int cpu)
{
- unsigned long cpu;
+ u8 *dst;
- cpu_notifier_register_begin();
- for_each_online_cpu(cpu)
- __zswap_cpu_dstmem_notifier(CPU_UP_CANCELED, cpu);
- __unregister_cpu_notifier(&zswap_dstmem_notifier);
- cpu_notifier_register_done();
+ dst = per_cpu(zswap_dstmem, cpu);
+ kfree(dst);
+ per_cpu(zswap_dstmem, cpu) = NULL;
+
+ return 0;
}
static int __zswap_cpu_comp_notifier(struct zswap_pool *pool,
@@ -1238,6 +1196,7 @@ static void __exit zswap_debugfs_exit(void) { }
static int __init init_zswap(void)
{
struct zswap_pool *pool;
+ int ret;
zswap_init_started = true;
@@ -1246,7 +1205,9 @@ static int __init init_zswap(void)
goto cache_fail;
}
- if (zswap_cpu_dstmem_init()) {
+ ret = cpuhp_setup_state(CPUHP_MM_ZSWP_MEM_PREPARE, "mm/zswap:prepare",
+ zswap_dstmem_prepare, zswap_dstmem_dead);
+ if (ret) {
pr_err("dstmem alloc failed\n");
goto dstmem_fail;
}
@@ -1267,7 +1228,7 @@ static int __init init_zswap(void)
return 0;
pool_fail:
- zswap_cpu_dstmem_destroy();
+ cpuhp_remove_state(CPUHP_MM_ZSWP_MEM_PREPARE);
dstmem_fail:
zswap_entry_cache_destroy();
cache_fail:
--
2.10.2
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next prev parent reply other threads:[~2016-11-26 23:14 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20161126231350.10321-1-bigeasy@linutronix.de>
2016-11-26 23:13 ` [PATCH 07/22] mm/vmstat: Drop get_online_cpus() from init_cpu_node_state/vmstat_cpu_dead() Sebastian Andrzej Siewior
2016-11-28 9:24 ` Michal Hocko
2016-11-26 23:13 ` [PATCH 08/22] mm/vmstat: Avoid on each online CPU loops Sebastian Andrzej Siewior
2016-11-28 9:28 ` Michal Hocko
2016-11-29 14:08 ` Thomas Gleixner
2016-11-29 14:44 ` Michal Hocko
2016-11-29 14:51 ` [PATCH 08/22 v2] " Sebastian Andrzej Siewior
2016-11-29 15:20 ` Michal Hocko
2016-11-26 23:13 ` [PATCH 09/22] mm/vmstat: Convert to hotplug state machine Sebastian Andrzej Siewior
2016-11-29 14:52 ` [PATCH 09/22 v2] " Sebastian Andrzej Siewior
2016-11-26 23:13 ` [PATCH 10/22] mm/zsmalloc: " Sebastian Andrzej Siewior
2016-11-26 23:13 ` Sebastian Andrzej Siewior [this message]
2016-11-26 23:13 ` [PATCH 12/22] mm/zswap: Convert pool " Sebastian Andrzej Siewior
2016-11-26 23:13 ` [PATCH 14/22] mm/compaction: Convert " Sebastian Andrzej Siewior
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