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Message-ID: <20150113150133.GI25318@dhcp22.suse.cz>
Date: Tue, 13 Jan 2015 16:01:33 +0100
From: Michal Hocko <mhocko@...e.cz>
To: Johannes Weiner <hannes@...xchg.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Vladimir Davydov <vdavydov@...allels.com>, linux-mm@...ck.org,
cgroups@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 3/3] mm: memcontrol: consolidate swap controller code
On Fri 09-01-15 21:14:01, Johannes Weiner wrote:
> The swap controller code is scattered all over the file. Gather all
> the code that isn't directly needed by the memory controller at the
> end of the file in its own CONFIG_MEMCG_SWAP section.
Well, the idea was to stick with corresponding infrastructure I guess.
memsw_cgroup_files where together with mem_cgroup_files, swap accounting
with the charge routines. Putting everything together is certainly
an option as well. I do not feel strongly about either way. I tend
to dislike code churn but if it makes further changes easier then
definitely no objections from me.
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>
> ---
> mm/memcontrol.c | 264 +++++++++++++++++++++++++++-----------------------------
> 1 file changed, 125 insertions(+), 139 deletions(-)
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index f66bb8f83ac9..5a5769e8b12c 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -72,22 +72,13 @@ EXPORT_SYMBOL(memory_cgrp_subsys);
> #define MEM_CGROUP_RECLAIM_RETRIES 5
> static struct mem_cgroup *root_mem_cgroup __read_mostly;
>
> +/* Whether the swap controller is active */
> #ifdef CONFIG_MEMCG_SWAP
> -/* Turned on only when memory cgroup is enabled && really_do_swap_account = 1 */
> int do_swap_account __read_mostly;
> -
> -/* for remember boot option*/
> -#ifdef CONFIG_MEMCG_SWAP_ENABLED
> -static int really_do_swap_account __initdata = 1;
> -#else
> -static int really_do_swap_account __initdata;
> -#endif
> -
> #else
> #define do_swap_account 0
> #endif
>
> -
> static const char * const mem_cgroup_stat_names[] = {
> "cache",
> "rss",
> @@ -4382,34 +4373,6 @@ static struct cftype mem_cgroup_legacy_files[] = {
> { }, /* terminate */
> };
>
> -#ifdef CONFIG_MEMCG_SWAP
> -static struct cftype memsw_cgroup_files[] = {
> - {
> - .name = "memsw.usage_in_bytes",
> - .private = MEMFILE_PRIVATE(_MEMSWAP, RES_USAGE),
> - .read_u64 = mem_cgroup_read_u64,
> - },
> - {
> - .name = "memsw.max_usage_in_bytes",
> - .private = MEMFILE_PRIVATE(_MEMSWAP, RES_MAX_USAGE),
> - .write = mem_cgroup_reset,
> - .read_u64 = mem_cgroup_read_u64,
> - },
> - {
> - .name = "memsw.limit_in_bytes",
> - .private = MEMFILE_PRIVATE(_MEMSWAP, RES_LIMIT),
> - .write = mem_cgroup_write,
> - .read_u64 = mem_cgroup_read_u64,
> - },
> - {
> - .name = "memsw.failcnt",
> - .private = MEMFILE_PRIVATE(_MEMSWAP, RES_FAILCNT),
> - .write = mem_cgroup_reset,
> - .read_u64 = mem_cgroup_read_u64,
> - },
> - { }, /* terminate */
> -};
> -#endif
> static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node)
> {
> struct mem_cgroup_per_node *pn;
> @@ -5415,37 +5378,6 @@ struct cgroup_subsys memory_cgrp_subsys = {
> .early_init = 0,
> };
>
> -#ifdef CONFIG_MEMCG_SWAP
> -static int __init enable_swap_account(char *s)
> -{
> - if (!strcmp(s, "1"))
> - really_do_swap_account = 1;
> - else if (!strcmp(s, "0"))
> - really_do_swap_account = 0;
> - return 1;
> -}
> -__setup("swapaccount=", enable_swap_account);
> -
> -static void __init memsw_file_init(void)
> -{
> - WARN_ON(cgroup_add_legacy_cftypes(&memory_cgrp_subsys,
> - memsw_cgroup_files));
> -}
> -
> -static void __init enable_swap_cgroup(void)
> -{
> - if (!mem_cgroup_disabled() && really_do_swap_account) {
> - do_swap_account = 1;
> - memsw_file_init();
> - }
> -}
> -
> -#else
> -static void __init enable_swap_cgroup(void)
> -{
> -}
> -#endif
> -
> /**
> * mem_cgroup_events - count memory events against a cgroup
> * @memcg: the memory cgroup
> @@ -5496,74 +5428,6 @@ bool mem_cgroup_low(struct mem_cgroup *root, struct mem_cgroup *memcg)
> return true;
> }
>
> -#ifdef CONFIG_MEMCG_SWAP
> -/**
> - * mem_cgroup_swapout - transfer a memsw charge to swap
> - * @page: page whose memsw charge to transfer
> - * @entry: swap entry to move the charge to
> - *
> - * Transfer the memsw charge of @page to @entry.
> - */
> -void mem_cgroup_swapout(struct page *page, swp_entry_t entry)
> -{
> - struct mem_cgroup *memcg;
> - unsigned short oldid;
> -
> - VM_BUG_ON_PAGE(PageLRU(page), page);
> - VM_BUG_ON_PAGE(page_count(page), page);
> -
> - if (!do_swap_account)
> - return;
> -
> - memcg = page->mem_cgroup;
> -
> - /* Readahead page, never charged */
> - if (!memcg)
> - return;
> -
> - oldid = swap_cgroup_record(entry, mem_cgroup_id(memcg));
> - VM_BUG_ON_PAGE(oldid, page);
> - mem_cgroup_swap_statistics(memcg, true);
> -
> - page->mem_cgroup = NULL;
> -
> - if (!mem_cgroup_is_root(memcg))
> - page_counter_uncharge(&memcg->memory, 1);
> -
> - /* XXX: caller holds IRQ-safe mapping->tree_lock */
> - VM_BUG_ON(!irqs_disabled());
> -
> - mem_cgroup_charge_statistics(memcg, page, -1);
> - memcg_check_events(memcg, page);
> -}
> -
> -/**
> - * mem_cgroup_uncharge_swap - uncharge a swap entry
> - * @entry: swap entry to uncharge
> - *
> - * Drop the memsw charge associated with @entry.
> - */
> -void mem_cgroup_uncharge_swap(swp_entry_t entry)
> -{
> - struct mem_cgroup *memcg;
> - unsigned short id;
> -
> - if (!do_swap_account)
> - return;
> -
> - id = swap_cgroup_record(entry, 0);
> - rcu_read_lock();
> - memcg = mem_cgroup_lookup(id);
> - if (memcg) {
> - if (!mem_cgroup_is_root(memcg))
> - page_counter_uncharge(&memcg->memsw, 1);
> - mem_cgroup_swap_statistics(memcg, false);
> - css_put(&memcg->css);
> - }
> - rcu_read_unlock();
> -}
> -#endif
> -
> /**
> * mem_cgroup_try_charge - try charging a page
> * @page: page to charge
> @@ -5920,8 +5784,130 @@ static int __init mem_cgroup_init(void)
> soft_limit_tree.rb_tree_per_node[nid] = rtpn;
> }
>
> - enable_swap_cgroup();
> -
> return 0;
> }
> subsys_initcall(mem_cgroup_init);
> +
> +#ifdef CONFIG_MEMCG_SWAP
> +/**
> + * mem_cgroup_swapout - transfer a memsw charge to swap
> + * @page: page whose memsw charge to transfer
> + * @entry: swap entry to move the charge to
> + *
> + * Transfer the memsw charge of @page to @entry.
> + */
> +void mem_cgroup_swapout(struct page *page, swp_entry_t entry)
> +{
> + struct mem_cgroup *memcg;
> + unsigned short oldid;
> +
> + VM_BUG_ON_PAGE(PageLRU(page), page);
> + VM_BUG_ON_PAGE(page_count(page), page);
> +
> + if (!do_swap_account)
> + return;
> +
> + memcg = page->mem_cgroup;
> +
> + /* Readahead page, never charged */
> + if (!memcg)
> + return;
> +
> + oldid = swap_cgroup_record(entry, mem_cgroup_id(memcg));
> + VM_BUG_ON_PAGE(oldid, page);
> + mem_cgroup_swap_statistics(memcg, true);
> +
> + page->mem_cgroup = NULL;
> +
> + if (!mem_cgroup_is_root(memcg))
> + page_counter_uncharge(&memcg->memory, 1);
> +
> + /* XXX: caller holds IRQ-safe mapping->tree_lock */
> + VM_BUG_ON(!irqs_disabled());
> +
> + mem_cgroup_charge_statistics(memcg, page, -1);
> + memcg_check_events(memcg, page);
> +}
> +
> +/**
> + * mem_cgroup_uncharge_swap - uncharge a swap entry
> + * @entry: swap entry to uncharge
> + *
> + * Drop the memsw charge associated with @entry.
> + */
> +void mem_cgroup_uncharge_swap(swp_entry_t entry)
> +{
> + struct mem_cgroup *memcg;
> + unsigned short id;
> +
> + if (!do_swap_account)
> + return;
> +
> + id = swap_cgroup_record(entry, 0);
> + rcu_read_lock();
> + memcg = mem_cgroup_lookup(id);
> + if (memcg) {
> + if (!mem_cgroup_is_root(memcg))
> + page_counter_uncharge(&memcg->memsw, 1);
> + mem_cgroup_swap_statistics(memcg, false);
> + css_put(&memcg->css);
> + }
> + rcu_read_unlock();
> +}
> +
> +/* for remember boot option*/
> +#ifdef CONFIG_MEMCG_SWAP_ENABLED
> +static int really_do_swap_account __initdata = 1;
> +#else
> +static int really_do_swap_account __initdata;
> +#endif
> +
> +static int __init enable_swap_account(char *s)
> +{
> + if (!strcmp(s, "1"))
> + really_do_swap_account = 1;
> + else if (!strcmp(s, "0"))
> + really_do_swap_account = 0;
> + return 1;
> +}
> +__setup("swapaccount=", enable_swap_account);
> +
> +static struct cftype memsw_cgroup_files[] = {
> + {
> + .name = "memsw.usage_in_bytes",
> + .private = MEMFILE_PRIVATE(_MEMSWAP, RES_USAGE),
> + .read_u64 = mem_cgroup_read_u64,
> + },
> + {
> + .name = "memsw.max_usage_in_bytes",
> + .private = MEMFILE_PRIVATE(_MEMSWAP, RES_MAX_USAGE),
> + .write = mem_cgroup_reset,
> + .read_u64 = mem_cgroup_read_u64,
> + },
> + {
> + .name = "memsw.limit_in_bytes",
> + .private = MEMFILE_PRIVATE(_MEMSWAP, RES_LIMIT),
> + .write = mem_cgroup_write,
> + .read_u64 = mem_cgroup_read_u64,
> + },
> + {
> + .name = "memsw.failcnt",
> + .private = MEMFILE_PRIVATE(_MEMSWAP, RES_FAILCNT),
> + .write = mem_cgroup_reset,
> + .read_u64 = mem_cgroup_read_u64,
> + },
> + { }, /* terminate */
> +};
> +
> +static int __init mem_cgroup_swap_init(void)
> +{
> + if (!mem_cgroup_disabled() && really_do_swap_account) {
> + do_swap_account = 1;
> + WARN_ON(cgroup_add_legacy_cftypes(&memory_cgrp_subsys,
> + memsw_cgroup_files));
> + }
> + return 0;
> +}
> +subsys_initcall(mem_cgroup_swap_init);
> +
> +#endif /* CONFIG_MEMCG_SWAP */
> --
> 2.2.0
>
--
Michal Hocko
SUSE Labs
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