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Thu, 4 Feb 2021 04:47:05 +0000 (UTC) Received: from [127.0.0.1] (unknown [222.209.9.63]) by mail.loongson.cn (Coremail) with SMTP id AQAAf9Ax2dU1fBtgcjoDAA--.1370S2; Thu, 04 Feb 2021 12:46:49 +0800 (CST) Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Mailer: BlackBerry Email (10.3.3.3216) Message-ID: <20210204044648.5763159.1780.9288@loongson.cn> Date: Thu, 04 Feb 2021 12:46:48 +0800 Subject: Re: [PATCH] MIPS: make userspace mapping young by default From: =?utf-8?b?6buE5rKb?= In-Reply-To: <1612409285.q4gi3x2bhk.astroid@bobo.none> References: <20210204013942.8398-1-huangpei@loongson.cn> <1612409285.q4gi3x2bhk.astroid@bobo.none> To: Nicholas Piggin , ambrosehua@gmail.com, Thomas Bogendoerfer Cc: Andrew Morton , Huacai Chen , Gao Juxin , Jiaxun Yang , linux-arch@vger.kernel.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, Li Xuefeng , Bibo Mao , Paul Burton , Yang Tiezhu , Fuxin Zhang X-CM-TRANSID:AQAAf9Ax2dU1fBtgcjoDAA--.1370S2 X-Coremail-Antispam: 1UD129KBjvJXoW3Gry3Jw48JF1kKr1ftF4xWFg_yoW7AF4Upa s7Ca4Ik3yaqw13AFyxGwsrAw1ruwsxtF18trnrCF1Uu34fW34kKFnrKFWrZryDCFZ0y3y5 ZF1DXrs8uay3uFUanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUU9j14x267AKxVW8JVW5JwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2ocxC64kIII0Yj41l84x0c7CEw4AK67xGY2AK02 1l84ACjcxK6xIIjxv20xvE14v26r1I6r4UM28EF7xvwVC0I7IYx2IY6xkF7I0E14v26r4j 6F4UM28EF7xvwVC2z280aVAFwI0_Gr1j6F4UJwA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_Gc CE3s1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAqx4xG64xvF2IEw4CE5I8CrVC2j2WlYx0E 2Ix0cI8IcVAFwI0_JrI_JrylYx0Ex4A2jsIE14v26r1j6r4UMcvjeVCFs4IE7xkEbVWUJV W8JwACjcxG0xvY0x0EwIxGrwACjI8F5VA0II8E6IAqYI8I648v4I1lFIxGxcIEc7CjxVA2 Y2ka0xkIwI1lc2xSY4AK67AK6r45MxAIw28IcxkI7VAKI48JMxC20s026xCaFVCjc4AY6r 1j6r4UMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_JrI_JrWlx4CE17CE b7AF67AKxVWUtVW8ZwCIc40Y0x0EwIxGrwCI42IY6xIIjxv20xvE14v26r1j6r1xMIIF0x vE2Ix0cI8IcVCY1x0267AKxVW8JVWxJwCI42IY6xAIw20EY4v20xvaj40_Wr1j6rW3Jr1l IxAIcVC2z280aVAFwI0_Jr0_Gr1lIxAIcVC2z280aVCY1x0267AKxVW8JVW8JrUvcSsGvf C2KfnxnUUI43ZEXa7VUb38n5UUUUU== X-CM-SenderInfo: xkxd0whshlqz5rrqw2lrqou0/ X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: =E2=80=8EI am ok with it =C2=A0 Original Message =C2=A0 From: Nicholas Piggin Sent: 2021=E5=B9=B42=E6=9C=884=E6=97=A5=E6=98=9F=E6=9C=9F=E5=9B=9B 11:55 To: ambrosehua@gmail.com; Huang Pei; Thomas Bogendoerfer Cc: Andrew Morton; Huacai Chen; Gao Juxin; Jiaxun Yang; linux-arch@vger.ker= nel.org; linux-mips@vger.kernel.org; linux-mm@kvack.org; Li Xuefeng; Bibo M= ao; Paul Burton; Yang Tiezhu; Fuxin Zhang Subject: Re: [PATCH] MIPS: make userspace mapping young by default Excerpts from Huang Pei's message of February 4, 2021 11:39 am: > MIPS page fault path(except huge page) takes 3 exceptions (1 TLB Miss > + 2 TLB Invalid), butthe second TLB Invalid exception is just > triggered by __update_tlb from do_page_fault writing tlb without > _PAGE_VALID set. With this patch, user space mapping prot is made > young by default (with both _PAGE_VALID and _PAGE_YOUNG set), > and it only take 1 TLB Miss + 1 TLB Invalid exception >=20 > Remove pte_sw_mkyoung without polluting MM code and make page fault > delay of MIPS on par with other architecture >=20 > Signed-off-by: Huang Pei Could we merge this? For the core code, Reviewed-by: Nicholas Piggin > --- > arch/mips/mm/cache.c | 30 ++++++++++++++++-------------- > include/linux/pgtable.h | 8 -------- > mm/memory.c | 3 --- > 3 files changed, 16 insertions(+), 25 deletions(-) >=20 > diff --git a/arch/mips/mm/cache.c b/arch/mips/mm/cache.c > index 23b16bfd97b2..e19cf424bb39 100644 > --- a/arch/mips/mm/cache.c > +++ b/arch/mips/mm/cache.c > @@ -156,29 +156,31 @@ unsigned long _page_cachable_default; > EXPORT_SYMBOL(_page_cachable_default); >=20 > #define PM(p) __pgprot(_page_cachable_default | (p)) > +#define PVA(p) PM(_PAGE_VALID | _PAGE_ACCESSED | (p)) >=20 > static inline void setup_protection_map(void) > { > protection_map[0] =3D PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ); > - protection_map[1] =3D PM(_PAGE_PRESENT | _PAGE_NO_EXEC); > - protection_map[2] =3D PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ); > - protection_map[3] =3D PM(_PAGE_PRESENT | _PAGE_NO_EXEC); > - protection_map[4] =3D PM(_PAGE_PRESENT); > - protection_map[5] =3D PM(_PAGE_PRESENT); > - protection_map[6] =3D PM(_PAGE_PRESENT); > - protection_map[7] =3D PM(_PAGE_PRESENT); > + protection_map[1] =3D PVA(_PAGE_PRESENT | _PAGE_NO_EXEC); > + protection_map[2] =3D PVA(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ= ); > + protection_map[3] =3D PVA(_PAGE_PRESENT | _PAGE_NO_EXEC); > + protection_map[4] =3D PVA(_PAGE_PRESENT); > + protection_map[5] =3D PVA(_PAGE_PRESENT); > + protection_map[6] =3D PVA(_PAGE_PRESENT); > + protection_map[7] =3D PVA(_PAGE_PRESENT); >=20 > protection_map[8] =3D PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ); > - protection_map[9] =3D PM(_PAGE_PRESENT | _PAGE_NO_EXEC); > - protection_map[10] =3D PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE | > + protection_map[9] =3D PVA(_PAGE_PRESENT | _PAGE_NO_EXEC); > + protection_map[10] =3D PVA(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE | > _PAGE_NO_READ); > - protection_map[11] =3D PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE); > - protection_map[12] =3D PM(_PAGE_PRESENT); > - protection_map[13] =3D PM(_PAGE_PRESENT); > - protection_map[14] =3D PM(_PAGE_PRESENT | _PAGE_WRITE); > - protection_map[15] =3D PM(_PAGE_PRESENT | _PAGE_WRITE); > + protection_map[11] =3D PVA(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE); > + protection_map[12] =3D PVA(_PAGE_PRESENT); > + protection_map[13] =3D PVA(_PAGE_PRESENT); > + protection_map[14] =3D PVA(_PAGE_PRESENT); > + protection_map[15] =3D PVA(_PAGE_PRESENT); > } >=20 > +#undef _PVA > #undef PM >=20 > void cpu_cache_init(void) > diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h > index 8fcdfa52eb4b..8c042627399a 100644 > --- a/include/linux/pgtable.h > +++ b/include/linux/pgtable.h > @@ -432,14 +432,6 @@ static inline void ptep_set_wrprotect(struct mm_stru= ct *mm, unsigned long addres > * To be differentiate with macro pte_mkyoung, this macro is used on platf= orms > * where software maintains page access bit. > */ > -#ifndef pte_sw_mkyoung > -static inline pte_t pte_sw_mkyoung(pte_t pte) > -{ > - return pte; > -} > -#define pte_sw_mkyoung pte_sw_mkyoung > -#endif > - > #ifndef pte_savedwrite > #define pte_savedwrite pte_write > #endif > diff --git a/mm/memory.c b/mm/memory.c > index feff48e1465a..95718a623884 100644 > --- a/mm/memory.c > +++ b/mm/memory.c > @@ -2890,7 +2890,6 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf) > } > flush_cache_page(vma, vmf->address, pte_pfn(vmf->orig_pte)); > entry =3D mk_pte(new_page, vma->vm_page_prot); > - entry =3D pte_sw_mkyoung(entry); > entry =3D maybe_mkwrite(pte_mkdirty(entry), vma); >=20 > /* > @@ -3548,7 +3547,6 @@ static vm_fault_t do_anonymous_page(struct vm_fault= *vmf) > __SetPageUptodate(page); >=20 > entry =3D mk_pte(page, vma->vm_page_prot); > - entry =3D pte_sw_mkyoung(entry); > if (vma->vm_flags & VM_WRITE) > entry =3D pte_mkwrite(pte_mkdirty(entry)); >=20 > @@ -3824,7 +3822,6 @@ vm_fault_t alloc_set_pte(struct vm_fault *vmf, stru= ct page *page) >=20 > flush_icache_page(vma, page); > entry =3D mk_pte(page, vma->vm_page_prot); > - entry =3D pte_sw_mkyoung(entry); > if (write) > entry =3D maybe_mkwrite(pte_mkdirty(entry), vma); > /* copy-on-write page */ > --=20 > 2.17.1 >=20 >=20 >=20