公开(公告)号：US20210117317A1

公开(公告)日：2021-04-22

申请号：US16937661

申请日：2020-07-24

Applicant: Kioxia Corporation

Inventor： Yoko MASUO ,  Yosuke MITSUMASU

IPC: G06F12/02 ,  G06F3/06 ,  G06F17/18

Abstract: According to one embodiment, a memory system includes a controller which controls garbage collection for preparing one or more free blocks by writing valid data read from N blocks to one or more blocks of less than the N. The controller calculates a performance ratio between writing of data in response to a request from a host device and writing of data for the garbage collection in accordance with a data writable capacity remaining in a nonvolatile memory, calculates an average performance ratio from calculated performance ratios of M generations including a calculated latest performance ratio, and adjusts a performance cycle of the garbage collection by applying one of the calculated latest performance ratio and the calculated average performance ratio.

公开(公告)号：US20210073118A1

公开(公告)日：2021-03-11

申请号：US16787133

申请日：2020-02-11

Applicant: Kioxia Corporation

Inventor： Yoko MASUO ,  Yosuke MITSUMASU ,  Kazuya KITSUNAI

IPC: G06F12/02 ,  G06F3/06

Abstract: According to one embodiment, a memory system includes a nonvolatile memory and a controller. The nonvolatile memory includes a plurality of blocks. The controller controls an operation of writing data to the nonvolatile memory and an operation of reading data to the nonvolatile memory. The controller includes a first processor and a second processor. The first processor executes a first process of creating one or more free blocks by transferring valid data in N blocks (where N is a natural number greater than or equal to two) to blocks of number less than N. The second processor executes a second process of transferring valid data including data which needs refresh in M blocks (where M is a natural number greater than or equal to one) to blocks of number less than or equal to M.