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Shutemov" , Mike Rapoport , Jeremy Cline , linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [patch 1/2] mm, shmem: add thp fault alloc and fallback stats In-Reply-To: Message-ID: References: User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII 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: The thp_fault_alloc and thp_fault_fallback vmstats are incremented when a hugepage is successfully or unsuccessfully allocated, respectively, during a page fault for anonymous memory. Extend this to shmem as well. Note that care is taken to increment thp_fault_alloc only when the fault succeeds; this is the same behavior as anonymous thp. Signed-off-by: David Rientjes --- mm/shmem.c | 23 ++++++++++++++--------- 1 file changed, 14 insertions(+), 9 deletions(-) diff --git a/mm/shmem.c b/mm/shmem.c --- a/mm/shmem.c +++ b/mm/shmem.c @@ -1502,9 +1502,8 @@ static struct page *shmem_alloc_page(gfp_t gfp, return page; } -static struct page *shmem_alloc_and_acct_page(gfp_t gfp, - struct inode *inode, - pgoff_t index, bool huge) +static struct page *shmem_alloc_and_acct_page(gfp_t gfp, struct inode *inode, + pgoff_t index, bool fault, bool huge) { struct shmem_inode_info *info = SHMEM_I(inode); struct page *page; @@ -1518,9 +1517,11 @@ static struct page *shmem_alloc_and_acct_page(gfp_t gfp, if (!shmem_inode_acct_block(inode, nr)) goto failed; - if (huge) + if (huge) { page = shmem_alloc_hugepage(gfp, info, index); - else + if (!page && fault) + count_vm_event(THP_FAULT_FALLBACK); + } else page = shmem_alloc_page(gfp, info, index); if (page) { __SetPageLocked(page); @@ -1832,11 +1833,10 @@ static int shmem_getpage_gfp(struct inode *inode, pgoff_t index, } alloc_huge: - page = shmem_alloc_and_acct_page(gfp, inode, index, true); + page = shmem_alloc_and_acct_page(gfp, inode, index, vmf, true); if (IS_ERR(page)) { alloc_nohuge: - page = shmem_alloc_and_acct_page(gfp, inode, - index, false); + page = shmem_alloc_and_acct_page(gfp, inode, index, vmf, false); } if (IS_ERR(page)) { int retry = 5; @@ -1871,8 +1871,11 @@ static int shmem_getpage_gfp(struct inode *inode, pgoff_t index, error = mem_cgroup_try_charge_delay(page, charge_mm, gfp, &memcg, PageTransHuge(page)); - if (error) + if (error) { + if (vmf && PageTransHuge(page)) + count_vm_event(THP_FAULT_FALLBACK); goto unacct; + } error = shmem_add_to_page_cache(page, mapping, hindex, NULL, gfp & GFP_RECLAIM_MASK); if (error) { @@ -1883,6 +1886,8 @@ static int shmem_getpage_gfp(struct inode *inode, pgoff_t index, mem_cgroup_commit_charge(page, memcg, false, PageTransHuge(page)); lru_cache_add_anon(page); + if (vmf && PageTransHuge(page)) + count_vm_event(THP_FAULT_ALLOC); spin_lock_irq(&info->lock); info->alloced += compound_nr(page);