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charset="us-ascii" Content-ID: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: 1f412b9e-6367-44e4-7336-08d6f85c4225 X-MS-Exchange-CrossTenant-originalarrivaltime: 24 Jun 2019 04:27:24.8192 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 8ae927fe-1255-47a7-a2af-5f3a069daaa2 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: songliubraving@fb.com X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR15MB1278 X-OriginatorOrg: fb.com X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-06-24_04:,, signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1906240036 X-FB-Internal: deliver 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: Hi Hillf, > On Jun 23, 2019, at 8:16 PM, Hillf Danton wrote: >=20 >=20 > Hello >=20 > On Sun, 23 Jun 2019 13:48:47 +0800 Song Liu wrote: >> This patch is (hopefully) the first step to enable THP for non-shmem >> filesystems. >>=20 >> This patch enables an application to put part of its text sections to TH= P >> via madvise, for example: >>=20 >> madvise((void *)0x600000, 0x200000, MADV_HUGEPAGE); >>=20 >> We tried to reuse the logic for THP on tmpfs. >>=20 >> Currently, write is not supported for non-shmem THP. khugepaged will onl= y >> process vma with VM_DENYWRITE. The next patch will handle writes, which >> would only happen when the vma with VM_DENYWRITE is unmapped. >>=20 >> An EXPERIMENTAL config, READ_ONLY_THP_FOR_FS, is added to gate this >> feature. >>=20 >> Acked-by: Rik van Riel >> Signed-off-by: Song Liu >> --- >> mm/Kconfig | 11 ++++++ >> mm/filemap.c | 4 +-- >> mm/khugepaged.c | 90 ++++++++++++++++++++++++++++++++++++++++--------- >> mm/rmap.c | 12 ++++--- >> 4 files changed, 96 insertions(+), 21 deletions(-) >>=20 >> diff --git a/mm/Kconfig b/mm/Kconfig >> index f0c76ba47695..0a8fd589406d 100644 >> --- a/mm/Kconfig >> +++ b/mm/Kconfig >> @@ -762,6 +762,17 @@ config GUP_BENCHMARK >>=20 >> See tools/testing/selftests/vm/gup_benchmark.c >>=20 >> +config READ_ONLY_THP_FOR_FS >> + bool "Read-only THP for filesystems (EXPERIMENTAL)" >> + depends on TRANSPARENT_HUGE_PAGECACHE && SHMEM >> + > The ext4 mentioned in the cover letter, along with the subject line of > this patch, suggests the scissoring of SHMEM. We reuse khugepaged code for SHMEM, so the dependency does exist.=20 Thanks, Song