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[2001:44b8:111e:5c00:3f8b:a64e:9a27:b872]) by smtp.gmail.com with ESMTPSA id nv7sm3342006pjb.18.2021.04.15.16.29.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 15 Apr 2021 16:29:23 -0700 (PDT) From: Daniel Axtens To: Christophe Leroy , Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , Steven Price , akpm@linux-foundation.org Cc: linux-arch@vger.kernel.org, linux-s390@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v1 4/5] mm: ptdump: Support hugepd table entries In-Reply-To: References: Date: Fri, 16 Apr 2021 09:29:20 +1000 Message-ID: <87zgxzyvn3.fsf@dja-thinkpad.axtens.net> MIME-Version: 1.0 Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Christophe, > Which hugepd, page table entries can be at any level > and can be of any size. > > Add support for them. > > Signed-off-by: Christophe Leroy > --- > mm/ptdump.c | 17 +++++++++++++++-- > 1 file changed, 15 insertions(+), 2 deletions(-) > > diff --git a/mm/ptdump.c b/mm/ptdump.c > index 61cd16afb1c8..6efdb8c15a7d 100644 > --- a/mm/ptdump.c > +++ b/mm/ptdump.c > @@ -112,11 +112,24 @@ static int ptdump_pte_entry(pte_t *pte, unsigned long addr, > { > struct ptdump_state *st = walk->private; > pte_t val = ptep_get(pte); > + unsigned long page_size = next - addr; > + int level; > + > + if (page_size >= PGDIR_SIZE) > + level = 0; > + else if (page_size >= P4D_SIZE) > + level = 1; > + else if (page_size >= PUD_SIZE) > + level = 2; > + else if (page_size >= PMD_SIZE) > + level = 3; > + else > + level = 4; > > if (st->effective_prot) > - st->effective_prot(st, 4, pte_val(val)); > + st->effective_prot(st, level, pte_val(val)); > > - st->note_page(st, addr, 4, pte_val(val), PAGE_SIZE); > + st->note_page(st, addr, level, pte_val(val), page_size); It seems to me that passing both level and page_size is a bit redundant, but I guess it does reduce the impact on each arch's code? Kind regards, Daniel > > return 0; > } > -- > 2.25.0