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Message-ID: <008401d21a1f$aa29a510$fe7cef30$@alibaba-inc.com>
Date: Thu, 29 Sep 2016 15:04:03 +0800
From: "Hillf Danton" <hillf.zj@...baba-inc.com>
To: <tim.c.chen@...ux.intel.com>,
"'Andrew Morton'" <akpm@...ux-foundation.org>
Cc: <dave.hansen@...el.com>, <andi.kleen@...el.com>,
<aaron.lu@...el.com>, <linux-mm@...ck.org>,
<linux-kernel@...r.kernel.org>,
"'Huang Ying'" <ying.huang@...el.com>,
"'Hugh Dickins'" <hughd@...gle.com>,
"'Shaohua Li'" <shli@...nel.org>,
"'Minchan Kim'" <minchan@...nel.org>,
"'Rik van Riel'" <riel@...hat.com>,
"'Andrea Arcangeli'" <aarcange@...hat.com>,
"'Kirill A . Shutemov'" <kirill.shutemov@...ux.intel.com>,
"'Vladimir Davydov'" <vdavydov@...tuozzo.com>,
"'Johannes Weiner'" <hannes@...xchg.org>,
"'Michal Hocko'" <mhocko@...nel.org>
Subject: Re: [PATCH 7/8] mm/swap: Add cache for swap slots allocation
On Wednesday, September 28, 2016 1:19 AM Tim Chen wrote
[...]
> +
> +static int alloc_swap_slot_cache(int cpu)
> +{
> + struct swap_slots_cache *cache;
> +
> + cache = &per_cpu(swp_slots, cpu);
> + mutex_init(&cache->alloc_lock);
> + spin_lock_init(&cache->free_lock);
> + cache->nr = 0;
> + cache->cur = 0;
> + cache->n_ret = 0;
> + cache->slots = vzalloc(sizeof(swp_entry_t) * SWAP_SLOTS_CACHE_SIZE);
> + if (!cache->slots) {
> + swap_slot_cache_enabled = false;
> + return -ENOMEM;
> + }
> + cache->slots_ret = vzalloc(sizeof(swp_entry_t) * SWAP_SLOTS_CACHE_SIZE);
> + if (!cache->slots_ret) {
> + vfree(cache->slots);
> + swap_slot_cache_enabled = false;
> + return -ENOMEM;
> + }
> + return 0;
> +}
> +
[...]
> +
> +static void free_slot_cache(int cpu)
> +{
> + struct swap_slots_cache *cache;
> +
> + mutex_lock(&swap_slots_cache_mutex);
> + drain_slots_cache_cpu(cpu, SLOTS_CACHE | SLOTS_CACHE_RET);
> + cache = &per_cpu(swp_slots, cpu);
> + cache->nr = 0;
> + cache->cur = 0;
> + cache->n_ret = 0;
> + vfree(cache->slots);
Also free cache->slots_ret?
Or fold the relevant two allocations into one?
> + mutex_unlock(&swap_slots_cache_mutex);
> +}
>
thanks
Hillf
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