Received-SPF: pass (google.com: domain of linux-kernel+bounces-25658-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45e3:2400::1 as permitted sender) client-ip=2604:1380:45e3:2400::1;
Message-ID: <fb00ee99-ab5e-4274-af9d-cf4eca509d7d@vivo.com>
Date: Mon, 15 Jan 2024 14:27:01 +0800
User-Agent: Mozilla Thunderbird
Subject: Re: [PATCH -next v6 0/2] Make memory reclamation measurable
To: akpm@linux-foundation.org, rostedt@goodmis.org, mhiramat@kernel.org,
 mathieu.desnoyers@efficios.com
Cc: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org,
 linux-mm@kvack.org, opensource.kernel@vivo.com
References: <20240105013607.2868-1-cuibixuan@vivo.com>
From: Bixuan Cui <cuibixuan@vivo.com>
In-Reply-To: <20240105013607.2868-1-cuibixuan@vivo.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit
Precedence: bulk
MIME-Version: 1.0
X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1
X-MS-Exchange-AntiSpam-MessageData-0:
	=?utf-8?B?aUdEZlhWeGRYbllHc0x6MkUvZTl3alpoODN4V01TTkNHWE84NDNuRktBL2NV?=
 =?utf-8?B?SVFpT3VXVHZFM25sOVBTa1lCR2ZNa0wvVVZLTjBDYVhPV3F3MXd6Mm9QeWJG?=
 =?utf-8?B?Y2d5RCthU2FZazdiVWwxOC91Rnc0RUsxOUlJSHR3MnJFVDJkUnp3TldBWkY1?=
 =?utf-8?B?M2hNMitPWEdORFRYR2lhYng4Y0dyK2VReE5YN0lVUjhVd1VJc245d3NXaFRa?=
 =?utf-8?B?QzJ6Nm5sVWwzL0s0aFRsS1hnSzdBSnExbWU1WFlFSzRrT2ZnRjYzUEJXUm5i?=
 =?utf-8?B?WU5TaFNuSERVdmVsZzFkUDFoWXpuOUlRZFdIaHdjWEE0UTJLWFJ0NURUcXRG?=
 =?utf-8?B?NnlCekoxVURNVzdoQmZTcmdJcTAzbm5Mb2lPcWpqRitlVSs4ZFc5U1ZWTmpw?=
 =?utf-8?B?V2N5MW9kcVpmVjNDRlMwU0lQSmtWUHVzL3NCbWU3M3dtMjIyWEo4c3pmOFpo?=
 =?utf-8?B?Njd4K0NqMlBXSHNpRXdxUkFBWjZVUSsxS3pmN2loS3NURlVKOTVwZFBIUXAx?=
 =?utf-8?B?TTF1d0VRUXV6dERmMmsyTTRCSlhNWGVrczlUc25MbTJHQTRIQllRVzZFTStS?=
 =?utf-8?B?OGxwRlJ1MEpsTmt0WlhkMXArWWNZQ3pZQWdrZkFhbUZuVmdOUVYxQ0MweGVq?=
 =?utf-8?B?OGxhSDJvY2JtUWJhN0lpVUFzbGFXMUpEd1Bmck9keG9hbnhFQVE0NGJvYUlH?=
 =?utf-8?B?TXJ2OWZLK00yV3R3dzQrZE5nRGhBSEd2TkhBVU8yc1diYmtNQ0pHOUw1ODMw?=
 =?utf-8?B?YkVKS1ZKSWk4V0hPajlidFM1SFVXNnBCUXRPbXJ4dWdqRlhmODd5OXNXcDVw?=
 =?utf-8?B?dEhBNVp2UkphOWdZS0crZ29STDN1Z3Fub2t0RlhING9CNFFRTE1mNXI3NlJM?=
 =?utf-8?B?RnI1elFyNDkxN2F0UXZPUS9xSmZFajlsR2NYSGJWSjVPeXRuRlYydzNpMjQx?=
 =?utf-8?B?TlNvVzdrdDdoaGNTdUkrYXFndFRyTUhOMEx5ZEViQmFaOW40RG5YekVabFVW?=
 =?utf-8?B?bVZVb0dNV2lCa3RDR2NwcnViL3JkOXB4RGh6K255TTdqL0t4TnFNRlFjVlYr?=
 =?utf-8?B?YVZueW5TR1hqOHpQNk5qR1BIbHZLNFlNTnhnMzk0U2NRUlV6UERsV0o5OXhF?=
 =?utf-8?B?d044bHFqczhJUVI4TmZZekJVOUdkYks2RzArYmJncGNqYWZwaGJxNnNTZ0tS?=
 =?utf-8?B?ZHdXWnhQbnhMUkdFL0NobmV3Z0ZZMm9aSk5aWUI3UE9uUG90dXdjSlpYU3BS?=
 =?utf-8?B?LzlhZDIyTU5nellhRUYrckt0ZGpaZjFZUkwwOVNrVDNXQW02NWxTREJBdXhY?=
 =?utf-8?B?UzJBYVJSTUw2NThaMm5qdTBuQVJGQkJSa2tIb0lkZS9hbUE1Umpzbm5lUDJB?=
 =?utf-8?B?REJ2MmZYMi9SUkVoODNhRm5zb1pGT3ZJNW9BUXdUc09YYjRGRVZSdWo5REpa?=
 =?utf-8?B?eml4ejRWeEZ4bDlBVDA0Y1ZVdDRRZC9CczRreFl2N0ZlQlNIZkdPbXV0YzVR?=
 =?utf-8?B?cnNsYVJpZmpYczUvaHlNVlhESGhvelVVR2xZU1hHazRzMHdWSFlkaDYrZGI4?=
 =?utf-8?B?MXhTVU9vWkpZVjA5S0NWMGYrMXJ5VHNPZTdTMVJpcEQ1S0FBUTd1UTl3ODJs?=
 =?utf-8?B?U0pFVFI3N0ZKV21FMWZka0NCeit0TExyQVdZRHpkRWZTR3p6ZEpnbXprVFhl?=
 =?utf-8?B?aHV0WkZFM1dFSFpWNklEUTVnN0l4ZnpheWpwcDgwR25Fci92cHNnUXdGOS9Y?=
 =?utf-8?B?L0JyZnk5dlplQkw0R2plSXFvV0l5QlZWUUFTMkFaV0VnLy9qaEZ5bW1sYjVI?=
 =?utf-8?B?Rzl5ZmtWK3Nsd2JSd3E1WGNiK2VLVnVqei9GandoVkUyZndrUlJlblM4L0d4?=
 =?utf-8?B?dENRSlB3K2J6K3g3b3p6aFRuYnJ4ZEtqd3A0TmIxWGtpaXBOUHRaeG8zZTBi?=
 =?utf-8?B?ZEVNKzBpbjRQbU4zakVwc0ZGZk9wMHNSc0FOSjYyU0dhdDIzNThXQjUvN1FL?=
 =?utf-8?B?T1gwVG5WdElCV0pqR1FzUERVeHV5OFptRjByclgxZ3NCNml0NTZsRFp0ZmJi?=
 =?utf-8?B?b2xxZVROZC9oVzlFZVV6WmUzVWZCMVo2azU2cDZEZDkzdGdGOEkwSkRvZ3RK?=
 =?utf-8?Q?uei7XnnuItCxg3Ar+Q5xJQGoI?=
X-OriginatorOrg: vivo.com
X-MS-Exchange-CrossTenant-Network-Message-Id: c6a87f56-712f-427d-fd24-08dc1592fe57
X-MS-Exchange-CrossTenant-AuthSource: TYZPR06MB4045.apcprd06.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Jan 2024 06:27:05.8394
 (UTC)
X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted
X-MS-Exchange-CrossTenant-Id: 923e42dc-48d5-4cbe-b582-1a797a6412ed
X-MS-Exchange-CrossTenant-MailboxType: HOSTED
X-MS-Exchange-CrossTenant-UserPrincipalName: 9IkNl3J6ActN+8av6+FFrul+Ucsalhzfp/Ou4lU+R7lUe/lsYRAK6yn47myJ/hkwu32QhvG5PRx56xH3PpIX1w==
X-MS-Exchange-Transport-CrossTenantHeadersStamped: PSAPR06MB3990

ping~

在 2024/1/5 9:36, Bixuan Cui 写道:
> When the system memory is low, kswapd reclaims the memory. The key steps
> of memory reclamation include
> 1.shrink_lruvec
>    * shrink_active_list, moves folios from the active LRU to the inactive LRU
>    * shrink_inactive_list, shrink lru from inactive LRU list
> 2.shrink_slab
>    * shrinker->count_objects(), calculates the freeable memory
>    * shrinker->scan_objects(), reclaims the slab memory
> 
> The existing tracers in the vmscan are as follows:
> 
> --do_try_to_free_pages
> --shrink_zones
> --trace_mm_vmscan_node_reclaim_begin (tracer)
> --shrink_node
> --shrink_node_memcgs
>    --trace_mm_vmscan_memcg_shrink_begin (tracer)
>    --shrink_lruvec
>      --shrink_list
>        --shrink_active_list
> 	  --trace_mm_vmscan_lru_shrink_active (tracer)
>        --shrink_inactive_list
> 	  --trace_mm_vmscan_lru_shrink_inactive (tracer)
>      --shrink_active_list
>    --shrink_slab
>      --do_shrink_slab
>      --shrinker->count_objects()
>      --trace_mm_shrink_slab_start (tracer)
>      --shrinker->scan_objects()
>      --trace_mm_shrink_slab_end (tracer)
>    --trace_mm_vmscan_memcg_shrink_end (tracer)
> --trace_mm_vmscan_node_reclaim_end (tracer)
> 
> If we get the duration and quantity of shrink lru and slab,
> then we can measure the memory recycling, as follows
> 
> Measuring memory reclamation with bpf:
>    LRU FILE:
> 	CPU COMM 	ShrinkActive(us) ShrinkInactive(us)  Reclaim(page)
> 	7   kswapd0	 	26		51		32
> 	7   kswapd0		52		47		13
>    SLAB:
> 	CPU COMM 		OBJ_NAME		Count_Dur(us) Freeable(page) Scan_Dur(us) Reclaim(page)
> 	 1  kswapd0		super_cache_scan.cfi_jt     2		    341		   3225		128
> 	 7  kswapd0		super_cache_scan.cfi_jt     0		    2247	   8524		1024
> 	 7  kswapd0	        super_cache_scan.cfi_jt     2367	    0		   0		0
> 
> For this, add the new tracer to shrink_active_list/shrink_inactive_list
> and shrinker->count_objects().
> 
> Changes:
> v6: * Add Reviewed-by from Steven Rostedt.
> v5: * Use 'DECLARE_EVENT_CLASS(mm_vmscan_lru_shrink_start_template' to
> replace 'RACE_EVENT(mm_vmscan_lru_shrink_inactive/active_start'
>      * Add the explanation for adding new shrink lru events into 'mm: vmscan: add new event to trace shrink lru'
> v4: Add Reviewed-by and Changlog to every patch.
> v3: Swap the positions of 'nid' and 'freeable' to prevent the hole in the trace event.
> v2: Modify trace_mm_vmscan_lru_shrink_inactive() in evict_folios() at the same time to fix build error.
> 
> cuibixuan (2):
>    mm: shrinker: add new event to trace shrink count
>    mm: vmscan: add new event to trace shrink lru
> 
>   include/trace/events/vmscan.h | 80 ++++++++++++++++++++++++++++++++++-
>   mm/shrinker.c                 |  4 ++
>   mm/vmscan.c                   | 11 +++--
>   3 files changed, 90 insertions(+), 5 deletions(-)
>