From: "Jarkko Sakkinen" <jarkko@kernel.org>
To: "Haitao Huang" <haitao.huang@linux.intel.com>,
<dave.hansen@linux.intel.com>, <tj@kernel.org>,
<mkoutny@suse.com>, <linux-kernel@vger.kernel.org>,
<linux-sgx@vger.kernel.org>, <x86@kernel.org>,
<cgroups@vger.kernel.org>, <tglx@linutronix.de>,
<mingo@redhat.com>, <bp@alien8.de>, <hpa@zytor.com>,
<sohil.mehta@intel.com>
Cc: <zhiquan1.li@intel.com>, <kristen@linux.intel.com>,
<seanjc@google.com>, <zhanb@microsoft.com>,
<anakrish@microsoft.com>, <mikko.ylinen@linux.intel.com>,
<yangjie@microsoft.com>,
"Sean Christopherson" <sean.j.christopherson@intel.com>
Subject: Re: [PATCH v6 08/12] x86/sgx: Use a list to track to-be-reclaimed pages
Date: Wed, 15 Nov 2023 22:59:40 +0200 [thread overview]
Message-ID: <CWZORJV320UP.1NJD0AI5M6QZT@kernel.org> (raw)
In-Reply-To: <20231030182013.40086-9-haitao.huang@linux.intel.com>
On Mon Oct 30, 2023 at 8:20 PM EET, Haitao Huang wrote:
> From: Sean Christopherson <sean.j.christopherson@intel.com>
>
> Change sgx_reclaim_pages() to use a list rather than an array for
> storing the epc_pages which will be reclaimed. This change is needed
> to transition to the LRU implementation for EPC cgroup support.
>
> When the EPC cgroup is implemented, the reclaiming process will do a
> pre-order tree walk for the subtree starting from the limit-violating
> cgroup. When each node is visited, candidate pages are selected from
> its "reclaimable" LRU list and moved into this temporary list. Passing a
> list from node to node for temporary storage in this walk is more
> straightforward than using an array.
>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> Co-developed-by: Kristen Carlson Accardi <kristen@linux.intel.com>
> Signed-off-by: Kristen Carlson Accardi <kristen@linux.intel.com>
> Co-developed-by: Haitao Huang<haitao.huang@linux.intel.com>
> Signed-off-by: Haitao Huang<haitao.huang@linux.intel.com>
> Cc: Sean Christopherson <seanjc@google.com>
> ---
> V6:
> - Remove extra list_del_init and style fix (Kai)
>
> V4:
> - Changes needed for patch reordering
> - Revised commit message
>
> V3:
> - Removed list wrappers
> ---
> arch/x86/kernel/cpu/sgx/main.c | 35 +++++++++++++++-------------------
> 1 file changed, 15 insertions(+), 20 deletions(-)
>
> diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c
> index e27ac73d8843..33bcba313d40 100644
> --- a/arch/x86/kernel/cpu/sgx/main.c
> +++ b/arch/x86/kernel/cpu/sgx/main.c
> @@ -296,12 +296,11 @@ static void sgx_reclaimer_write(struct sgx_epc_page *epc_page,
> */
> static void sgx_reclaim_pages(void)
> {
> - struct sgx_epc_page *chunk[SGX_NR_TO_SCAN];
> struct sgx_backing backing[SGX_NR_TO_SCAN];
> + struct sgx_epc_page *epc_page, *tmp;
> struct sgx_encl_page *encl_page;
> - struct sgx_epc_page *epc_page;
> pgoff_t page_index;
> - int cnt = 0;
> + LIST_HEAD(iso);
> int ret;
> int i;
>
> @@ -317,7 +316,7 @@ static void sgx_reclaim_pages(void)
>
> if (kref_get_unless_zero(&encl_page->encl->refcount) != 0) {
> sgx_epc_page_set_state(epc_page, SGX_EPC_PAGE_RECLAIM_IN_PROGRESS);
> - chunk[cnt++] = epc_page;
> + list_move_tail(&epc_page->list, &iso);
> } else
> /* The owner is freeing the page. No need to add the
> * page back to the list of reclaimable pages.
> @@ -326,8 +325,11 @@ static void sgx_reclaim_pages(void)
> }
> spin_unlock(&sgx_global_lru.lock);
>
> - for (i = 0; i < cnt; i++) {
> - epc_page = chunk[i];
> + if (list_empty(&iso))
> + return;
> +
> + i = 0;
> + list_for_each_entry_safe(epc_page, tmp, &iso, list) {
> encl_page = epc_page->owner;
>
> if (!sgx_reclaimer_age(epc_page))
> @@ -342,6 +344,7 @@ static void sgx_reclaim_pages(void)
> goto skip;
> }
>
> + i++;
> encl_page->desc |= SGX_ENCL_PAGE_BEING_RECLAIMED;
> mutex_unlock(&encl_page->encl->lock);
> continue;
> @@ -349,27 +352,19 @@ static void sgx_reclaim_pages(void)
> skip:
> spin_lock(&sgx_global_lru.lock);
> sgx_epc_page_set_state(epc_page, SGX_EPC_PAGE_RECLAIMABLE);
> - list_add_tail(&epc_page->list, &sgx_global_lru.reclaimable);
> + list_move_tail(&epc_page->list, &sgx_global_lru.reclaimable);
> spin_unlock(&sgx_global_lru.lock);
>
> kref_put(&encl_page->encl->refcount, sgx_encl_release);
> -
> - chunk[i] = NULL;
> - }
> -
> - for (i = 0; i < cnt; i++) {
> - epc_page = chunk[i];
> - if (epc_page)
> - sgx_reclaimer_block(epc_page);
> }
>
> - for (i = 0; i < cnt; i++) {
> - epc_page = chunk[i];
> - if (!epc_page)
> - continue;
> + list_for_each_entry(epc_page, &iso, list)
> + sgx_reclaimer_block(epc_page);
>
> + i = 0;
> + list_for_each_entry_safe(epc_page, tmp, &iso, list) {
> encl_page = epc_page->owner;
> - sgx_reclaimer_write(epc_page, &backing[i]);
> + sgx_reclaimer_write(epc_page, &backing[i++]);
Couldn't you alternatively "&backing[--i]" and not reset i to zero
before the loop?
>
> kref_put(&encl_page->encl->refcount, sgx_encl_release);
> sgx_epc_page_reset_state(epc_page);
BR, Jarkko
next prev parent reply other threads:[~2023-11-15 21:00 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-30 18:20 [PATCH v6 00/12] Add Cgroup support for SGX EPC memory Haitao Huang
2023-10-30 18:20 ` [PATCH v6 01/12] cgroup/misc: Add per resource callbacks for CSS events Haitao Huang
2023-11-15 20:25 ` Jarkko Sakkinen
2024-01-09 3:37 ` Haitao Huang
2024-01-10 19:55 ` Jarkko Sakkinen
2024-01-05 9:45 ` Michal Koutný
2024-01-06 1:42 ` Haitao Huang
2023-10-30 18:20 ` [PATCH v6 02/12] cgroup/misc: Export APIs for SGX driver Haitao Huang
2023-10-30 18:20 ` [PATCH v6 03/12] cgroup/misc: Add SGX EPC resource type Haitao Huang
2023-10-30 18:20 ` [PATCH v6 04/12] x86/sgx: Implement basic EPC misc cgroup functionality Haitao Huang
2023-11-06 12:09 ` Huang, Kai
2023-11-06 18:59 ` Haitao Huang
2023-11-06 22:18 ` Huang, Kai
2023-11-07 1:16 ` Haitao Huang
2023-11-07 2:08 ` Haitao Huang
2023-11-07 19:07 ` Huang, Kai
2023-11-20 3:16 ` Huang, Kai
2023-11-26 16:01 ` Haitao Huang
2023-11-26 16:32 ` Haitao Huang
2023-11-06 22:23 ` Huang, Kai
2023-11-15 20:48 ` Jarkko Sakkinen
2023-10-30 18:20 ` [PATCH v6 05/12] x86/sgx: Add sgx_epc_lru_list to encapsulate LRU list Haitao Huang
2023-10-30 18:20 ` [PATCH v6 06/12] x86/sgx: Use sgx_epc_lru_list for existing active page list Haitao Huang
2023-10-30 18:20 ` [PATCH v6 07/12] x86/sgx: Introduce EPC page states Haitao Huang
2023-11-15 20:53 ` Jarkko Sakkinen
2024-01-05 17:57 ` Dave Hansen
2024-01-06 1:45 ` Haitao Huang
2023-10-30 18:20 ` [PATCH v6 08/12] x86/sgx: Use a list to track to-be-reclaimed pages Haitao Huang
2023-11-15 20:59 ` Jarkko Sakkinen [this message]
2023-10-30 18:20 ` [PATCH v6 09/12] x86/sgx: Restructure top-level EPC reclaim function Haitao Huang
2023-11-20 3:45 ` Huang, Kai
2023-11-26 16:27 ` Haitao Huang
2023-11-27 9:57 ` Huang, Kai
2023-12-12 4:04 ` Haitao Huang
2023-12-13 11:17 ` Huang, Kai
2023-12-15 19:49 ` Haitao Huang
2023-12-18 1:44 ` Huang, Kai
2023-12-18 17:32 ` Mikko Ylinen
2023-12-18 21:24 ` Haitao Huang
2024-01-03 16:37 ` Dave Hansen
2024-01-04 19:11 ` Haitao Huang
2024-01-04 19:19 ` Jarkko Sakkinen
2024-01-04 19:27 ` Dave Hansen
2024-01-04 21:01 ` Haitao Huang
2024-01-05 14:43 ` Mikko Ylinen
2024-01-04 12:38 ` Michal Koutný
2024-01-04 19:20 ` Haitao Huang
2024-01-12 17:07 ` Haitao Huang
2024-01-13 21:04 ` Jarkko Sakkinen
2024-01-13 21:08 ` Jarkko Sakkinen
2023-10-30 18:20 ` [PATCH v6 10/12] x86/sgx: Implement EPC reclamation for cgroup Haitao Huang
2023-11-06 15:58 ` [PATCH] x86/sgx: Charge proper mem_cgroup for usage due to EPC reclamation by cgroups Haitao Huang
2023-11-06 16:10 ` [PATCH v6 10/12] x86/sgx: Implement EPC reclamation for cgroup Haitao Huang
2023-10-30 18:20 ` [PATCH v6 11/12] Docs/x86/sgx: Add description for cgroup support Haitao Huang
2023-10-30 18:20 ` [PATCH v6 12/12] selftests/sgx: Add scripts for EPC cgroup testing Haitao Huang
2023-11-15 21:00 ` Jarkko Sakkinen
2023-11-15 21:22 ` Haitao Huang
2023-11-06 3:26 ` [PATCH v6 00/12] Add Cgroup support for SGX EPC memory Jarkko Sakkinen
2023-11-06 15:48 ` Haitao Huang
2023-11-08 1:00 ` Haitao Huang
2024-01-05 18:29 ` Dave Hansen
2024-01-05 20:13 ` Haitao Huang
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