From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
To: Pasha Tatashin <pasha.tatashin@soleen.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
akpm@linux-foundation.org, x86@kernel.org, bp@alien8.de,
brauner@kernel.org, bristot@redhat.com, bsegall@google.com,
dave.hansen@linux.intel.com, dianders@chromium.org,
dietmar.eggemann@arm.com, eric.devolder@oracle.com,
hca@linux.ibm.com, hch@infradead.org, hpa@zytor.com,
jacob.jun.pan@linux.intel.com, jgg@ziepe.ca, jpoimboe@kernel.org,
jroedel@suse.de, juri.lelli@redhat.com,
kent.overstreet@linux.dev, kinseyho@google.com,
kirill.shutemov@linux.intel.com, lstoakes@gmail.com,
luto@kernel.org, mgorman@suse.de, mic@digikod.net,
michael.christie@oracle.com, mingo@redhat.com, mjguzik@gmail.com,
mst@redhat.com, npiggin@gmail.com, peterz@infradead.org,
pmladek@suse.com, rick.p.edgecombe@intel.com,
rostedt@goodmis.org, surenb@google.com, tglx@linutronix.de,
urezki@gmail.com, vincent.guittot@linaro.org
Subject: Re: [RFC 04/14] fork: Remove assumption that vm_area->nr_pages equals to THREAD_SIZE
Date: Sun, 17 Mar 2024 15:45:23 +0100 [thread overview]
Message-ID: <0c6974b4-ba1f-474c-aed4-6c06d26ddb0a@wanadoo.fr> (raw)
In-Reply-To: <20240311164638.2015063-5-pasha.tatashin@soleen.com>
Le 11/03/2024 à 17:46, Pasha Tatashin a écrit :
> In many places number of pages in the stack is detremined via
> (THREAD_SIZE / PAGE_SIZE). There is also a BUG_ON() that ensures that
> (THREAD_SIZE / PAGE_SIZE) is indeed equals to vm_area->nr_pages.
>
> However, with dynamic stacks, the number of pages in vm_area will grow
> with stack, therefore, use vm_area->nr_pages to determine the actual
> number of pages allocated in stack.
>
> Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
> ---
> kernel/fork.c | 18 +++++++++---------
> 1 file changed, 9 insertions(+), 9 deletions(-)
>
> diff --git a/kernel/fork.c b/kernel/fork.c
> index 60e812825a7a..a35f4008afa0 100644
> --- a/kernel/fork.c
> +++ b/kernel/fork.c
> @@ -243,13 +243,11 @@ static int free_vm_stack_cache(unsigned int cpu)
>
> static int memcg_charge_kernel_stack(struct vm_struct *vm)
Maybe s/vm/vm_area/ as done in 03/14?
CJ
> {
> - int i;
> - int ret;
> + int i, ret, nr_pages;
> int nr_charged = 0;
>
> - BUG_ON(vm->nr_pages != THREAD_SIZE / PAGE_SIZE);
> -
> - for (i = 0; i < THREAD_SIZE / PAGE_SIZE; i++) {
> + nr_pages = vm->nr_pages;
> + for (i = 0; i < nr_pages; i++) {
> ret = memcg_kmem_charge_page(vm->pages[i], GFP_KERNEL, 0);
> if (ret)
> goto err;
> @@ -531,9 +529,10 @@ static void account_kernel_stack(struct task_struct *tsk, int account)
> {
> if (IS_ENABLED(CONFIG_VMAP_STACK)) {
> struct vm_struct *vm = task_stack_vm_area(tsk);
> - int i;
> + int i, nr_pages;
>
> - for (i = 0; i < THREAD_SIZE / PAGE_SIZE; i++)
> + nr_pages = vm->nr_pages;
> + for (i = 0; i < nr_pages; i++)
> mod_lruvec_page_state(vm->pages[i], NR_KERNEL_STACK_KB,
> account * (PAGE_SIZE / 1024));
> } else {
> @@ -551,10 +550,11 @@ void exit_task_stack_account(struct task_struct *tsk)
>
> if (IS_ENABLED(CONFIG_VMAP_STACK)) {
> struct vm_struct *vm;
> - int i;
> + int i, nr_pages;
>
> vm = task_stack_vm_area(tsk);
> - for (i = 0; i < THREAD_SIZE / PAGE_SIZE; i++)
> + nr_pages = vm->nr_pages;
> + for (i = 0; i < nr_pages; i++)
> memcg_kmem_uncharge_page(vm->pages[i], 0);
> }
> }
next prev parent reply other threads:[~2024-03-17 14:45 UTC|newest]
Thread overview: 98+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-11 16:46 [RFC 00/14] Dynamic Kernel Stacks Pasha Tatashin
2024-03-11 16:46 ` [RFC 01/14] task_stack.h: remove obsolete __HAVE_ARCH_KSTACK_END check Pasha Tatashin
2024-03-17 14:36 ` Christophe JAILLET
2024-03-17 15:13 ` Pasha Tatashin
2024-03-11 16:46 ` [RFC 02/14] fork: Clean-up ifdef logic around stack allocation Pasha Tatashin
2024-03-11 16:46 ` [RFC 03/14] fork: Clean-up naming of vm_strack/vm_struct variables in vmap stacks code Pasha Tatashin
2024-03-17 14:42 ` Christophe JAILLET
2024-03-19 16:32 ` Pasha Tatashin
2024-03-11 16:46 ` [RFC 04/14] fork: Remove assumption that vm_area->nr_pages equals to THREAD_SIZE Pasha Tatashin
2024-03-17 14:45 ` Christophe JAILLET [this message]
2024-03-17 15:14 ` Pasha Tatashin
2024-03-11 16:46 ` [RFC 05/14] fork: check charging success before zeroing stack Pasha Tatashin
2024-03-12 15:57 ` Kirill A. Shutemov
2024-03-12 16:52 ` Pasha Tatashin
2024-03-11 16:46 ` [RFC 06/14] fork: zero vmap stack using clear_page() instead of memset() Pasha Tatashin
2024-03-12 7:15 ` Nikolay Borisov
2024-03-12 16:53 ` Pasha Tatashin
2024-03-14 7:55 ` Christophe Leroy
2024-03-14 13:52 ` Pasha Tatashin
2024-03-17 14:48 ` Christophe JAILLET
2024-03-17 15:15 ` Pasha Tatashin
2024-03-11 16:46 ` [RFC 07/14] fork: use the first page in stack to store vm_stack in cached_stacks Pasha Tatashin
2024-03-11 16:46 ` [RFC 08/14] fork: separate vmap stack alloction and free calls Pasha Tatashin
2024-03-14 15:18 ` Jeff Xie
2024-03-14 17:14 ` Pasha Tatashin
2024-03-17 14:51 ` Christophe JAILLET
2024-03-17 15:15 ` Pasha Tatashin
2024-03-11 16:46 ` [RFC 09/14] mm/vmalloc: Add a get_vm_area_node() and vmap_pages_range_noflush() public functions Pasha Tatashin
2024-03-11 16:46 ` [RFC 10/14] fork: Dynamic Kernel Stacks Pasha Tatashin
2024-03-11 19:32 ` Randy Dunlap
2024-03-11 19:55 ` Pasha Tatashin
2024-03-11 16:46 ` [RFC 11/14] x86: add support for " Pasha Tatashin
2024-03-11 22:17 ` Andy Lutomirski
2024-03-11 23:10 ` Pasha Tatashin
2024-03-11 23:33 ` Thomas Gleixner
2024-03-11 23:34 ` Andy Lutomirski
2024-03-12 0:08 ` Pasha Tatashin
2024-03-12 0:23 ` Pasha Tatashin
2024-03-11 23:34 ` Dave Hansen
2024-03-11 23:41 ` Andy Lutomirski
2024-03-11 23:56 ` Nadav Amit
2024-03-12 0:02 ` Andy Lutomirski
2024-03-12 7:20 ` Nadav Amit
2024-03-12 0:53 ` Dave Hansen
2024-03-12 1:25 ` H. Peter Anvin
2024-03-12 2:16 ` Andy Lutomirski
2024-03-12 2:20 ` H. Peter Anvin
2024-03-12 21:58 ` Andi Kleen
2024-03-13 10:23 ` Thomas Gleixner
2024-03-13 13:43 ` Pasha Tatashin
2024-03-13 15:28 ` Pasha Tatashin
2024-03-13 16:12 ` Thomas Gleixner
2024-03-14 14:03 ` Pasha Tatashin
2024-03-14 18:26 ` Thomas Gleixner
2024-03-11 16:46 ` [RFC 12/14] task_stack.h: Clean-up stack_not_used() implementation Pasha Tatashin
2024-03-11 16:46 ` [RFC 13/14] task_stack.h: Add stack_not_used() support for dynamic stack Pasha Tatashin
2024-03-11 16:46 ` [RFC 14/14] fork: Dynamic Kernel Stack accounting Pasha Tatashin
2024-03-11 17:09 ` [RFC 00/14] Dynamic Kernel Stacks Mateusz Guzik
2024-03-11 18:58 ` Pasha Tatashin
2024-03-11 19:21 ` Mateusz Guzik
2024-03-11 19:55 ` Pasha Tatashin
2024-03-12 17:18 ` H. Peter Anvin
2024-03-12 19:45 ` Pasha Tatashin
2024-03-12 21:36 ` H. Peter Anvin
2024-03-14 19:05 ` Kent Overstreet
2024-03-14 19:23 ` Pasha Tatashin
2024-03-14 19:28 ` Kent Overstreet
2024-03-14 19:34 ` Pasha Tatashin
2024-03-14 19:49 ` Kent Overstreet
2024-03-12 22:18 ` David Laight
2024-03-14 19:43 ` Matthew Wilcox
2024-03-14 19:53 ` Kent Overstreet
2024-03-14 19:57 ` Matthew Wilcox
2024-03-14 19:58 ` Kent Overstreet
2024-03-15 3:13 ` Pasha Tatashin
2024-03-15 3:39 ` H. Peter Anvin
2024-03-16 19:17 ` Pasha Tatashin
2024-03-17 0:41 ` Matthew Wilcox
2024-03-17 1:32 ` Kent Overstreet
2024-03-17 14:19 ` Pasha Tatashin
2024-03-17 14:43 ` Brian Gerst
2024-03-17 16:15 ` Pasha Tatashin
2024-03-17 21:30 ` Brian Gerst
2024-03-18 14:59 ` Pasha Tatashin
2024-03-18 21:02 ` Brian Gerst
2024-03-19 14:56 ` Pasha Tatashin
2024-03-17 18:57 ` David Laight
2024-03-18 15:09 ` Pasha Tatashin
2024-03-18 15:13 ` Pasha Tatashin
2024-03-18 15:19 ` Matthew Wilcox
2024-03-18 15:30 ` Pasha Tatashin
2024-03-18 15:53 ` David Laight
2024-03-18 16:57 ` Pasha Tatashin
2024-03-18 15:38 ` David Laight
2024-03-18 17:00 ` Pasha Tatashin
2024-03-18 17:37 ` Pasha Tatashin
2024-03-15 4:17 ` H. Peter Anvin
2024-03-17 0:47 ` H. Peter Anvin
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