[vm] transparent_hugepages=never [disk] devices_udev_regex=(ID_SERIAL=36d0946606d79f90025f3e09a0c1fc035 �→ )|(ID_SERIAL=36d0946606d79f90025f3e09a0c1f9e81) 559 elevator=noop The output include=balanced rules ACTION=="add|change", SUBSYSTEM=="block", ENV{ID_SERIAL}=="36 �→ d0946606d79f90025f3e09a0c1fc035", ATTR{queue/scheduler}=" �→ noop" ACTION=="add|change", SUBSYSTEM=="block", ENV{ID_SERIAL}=="36 tidb_version(): Release Version: v5.0.0 Edition: Community Git Commit Hash: 689a6b6439ae7835947fcaccf329a3fc303986cb Git Branch: HEAD UTC Build Time: 2020-05-28 11:09:45 GoVersion: go1.13.4 609 Race Enabled:

[vm] transparent_hugepages=never [disk] devices_udev_regex=(ID_SERIAL=36d0946606d79f90025f3e09a0c1fc035 �→ )|(ID_SERIAL=36d0946606d79f90025f3e09a0c1f9e81) 131 elevator=noop The output include=balanced rules ACTION=="add|change", SUBSYSTEM=="block", ENV{ID_SERIAL}=="36 �→ d0946606d79f90025f3e09a0c1fc035", ATTR{queue/scheduler}=" �→ noop" ACTION=="add|change", SUBSYSTEM=="block", ENV{ID_SERIAL}=="36 tidb_version(): Release Version: v5.0.0 Edition: Community Git Commit Hash: 689a6b6439ae7835947fcaccf329a3fc303986cb Git Branch: HEAD UTC Build Time: 2020-05-28 11:09:45 GoVersion: go1.13.4 180 Race Enabled:

Otherwise, the transaction will be rolled back. func TiDBGormBegin(db *gorm.DB, pessimistic bool, fc func(tx *gorm.DB) error) (err error) { 106 session := db.Session(&gorm.Session{}) if session.Error @@tidb_txn_mode=optimistic") } if session.Error != nil { return session.Error } return session.Transaction(fc) } 进入目录 gorm ： cd gorm 目录结构如下所示： . ├ ─ ─ Makefile ├ ─ ─ go.mod ├ ─ ─ go.sum └ ─ ─ gorm.go transparent_hugepages=never 455 [disk] devices_udev_regex=(ID_SERIAL=36d0946606d79f90025f3e09a0c1fc035)|(ID_SERIAL=36 �→ d0946606d79f90025f3e09a0c1f9e81) elevator=noop include=balanced 表示在现有的 balanced

[vm] transparent_hugepages=never [disk] devices_udev_regex=(ID_SERIAL=36d0946606d79f90025f3e09a0c1fc035 �→ )|(ID_SERIAL=36d0946606d79f90025f3e09a0c1f9e81) 127 elevator=noop The output include=balanced rules ACTION=="add|change", SUBSYSTEM=="block", ENV{ID_SERIAL}=="36 �→ d0946606d79f90025f3e09a0c1fc035", ATTR{queue/scheduler}=" �→ noop" ACTION=="add|change", SUBSYSTEM=="block", ENV{ID_SERIAL}=="36 tidb_version(): Release Version: v5.0.0 Edition: Community Git Commit Hash: 689a6b6439ae7835947fcaccf329a3fc303986cb Git Branch: HEAD UTC Build Time: 2020-05-28 11:09:45 GoVersion: go1.13.4 169 Race Enabled:

[vm] transparent_hugepages=never [disk] devices_udev_regex=(ID_SERIAL=36d0946606d79f90025f3e09a0c1fc035)|(ID_SERIAL=36 �→ d0946606d79f90025f3e09a0c1f9e81) elevator=noop include=balanced 表示在现有的 balanced rules ACTION=="add|change", SUBSYSTEM=="block", ENV{ID_SERIAL}=="36 �→ d0946606d79f90025f3e09a0c1fc035", ATTR{queue/scheduler}="noop" ACTION=="add|change", SUBSYSTEM=="block", ENV{ID_SERIAL}=="36 �→ tidb_version(): Release Version: v5.0.0 Edition: Community Git Commit Hash: 689a6b6439ae7835947fcaccf329a3fc303986cb Git Branch: HEAD UTC Build Time: 2020-05-28 11:09:45 GoVersion: go1.13.4 Race Enabled:

[vm] transparent_hugepages=never [disk] devices_udev_regex=(ID_SERIAL=36d0946606d79f90025f3e09a0c1fc035 �→ )|(ID_SERIAL=36d0946606d79f90025f3e09a0c1f9e81) elevator=noop The output include=balanced rules ACTION=="add|change", SUBSYSTEM=="block", ENV{ID_SERIAL}=="36 �→ d0946606d79f90025f3e09a0c1fc035", ATTR{queue/scheduler}=" �→ noop" ACTION=="add|change", SUBSYSTEM=="block", ENV{ID_SERIAL}=="36 tidb_version(): Release Version: v5.0.0 Edition: Community Git Commit Hash: 689a6b6439ae7835947fcaccf329a3fc303986cb Git Branch: HEAD UTC Build Time: 2020-05-28 11:09:45 GoVersion: go1.13.4 674 Race Enabled:

[vm] transparent_hugepages=never [disk] devices_udev_regex=(ID_SERIAL=36d0946606d79f90025f3e09a0c1fc035 �→ )|(ID_SERIAL=36d0946606d79f90025f3e09a0c1f9e81) elevator=noop The output include=balanced rules ACTION=="add|change", SUBSYSTEM=="block", ENV{ID_SERIAL}=="36 �→ d0946606d79f90025f3e09a0c1fc035", ATTR{queue/scheduler}=" �→ noop" ACTION=="add|change", SUBSYSTEM=="block", ENV{ID_SERIAL}=="36 tidb_version(): Release Version: v5.0.0 Edition: Community Git Commit Hash: 689a6b6439ae7835947fcaccf329a3fc303986cb Git Branch: HEAD UTC Build Time: 2020-05-28 11:09:45 693 GoVersion: go1.13.4 Race Enabled:

[vm] transparent_hugepages=never [disk] devices_udev_regex=(ID_SERIAL=36d0946606d79f90025f3e09a0c1fc035 �→ )|(ID_SERIAL=36d0946606d79f90025f3e09a0c1f9e81) 626 elevator=noop The output include=balanced rules ACTION=="add|change", SUBSYSTEM=="block", ENV{ID_SERIAL}=="36 �→ d0946606d79f90025f3e09a0c1fc035", ATTR{queue/scheduler}=" �→ noop" ACTION=="add|change", SUBSYSTEM=="block", ENV{ID_SERIAL}=="36 tidb_version(): Release Version: v5.0.0 Edition: Community Git Commit Hash: 689a6b6439ae7835947fcaccf329a3fc303986cb Git Branch: HEAD UTC Build Time: 2020-05-28 11:09:45 GoVersion: go1.13.4 676 Race Enabled:

[vm] transparent_hugepages=never [disk] devices_udev_regex=(ID_SERIAL=36d0946606d79f90025f3e09a0c1fc035 �→ )|(ID_SERIAL=36d0946606d79f90025f3e09a0c1f9e81) elevator=noop The output include=balanced rules ACTION=="add|change", SUBSYSTEM=="block", ENV{ID_SERIAL}=="36 �→ d0946606d79f90025f3e09a0c1fc035", ATTR{queue/scheduler}=" �→ noop" ACTION=="add|change", SUBSYSTEM=="block", ENV{ID_SERIAL}=="36 tidb_version(): Release Version: v5.0.0 Edition: Community Git Commit Hash: 689a6b6439ae7835947fcaccf329a3fc303986cb Git Branch: HEAD UTC Build Time: 2020-05-28 11:09:45 GoVersion: go1.13.4 688 Race Enabled:

[vm] transparent_hugepages=never [disk] devices_udev_regex=(ID_SERIAL=36d0946606d79f90025f3e09a0c1fc035 �→ )|(ID_SERIAL=36d0946606d79f90025f3e09a0c1f9e81) 637 elevator=noop The output include=balanced rules ACTION=="add|change", SUBSYSTEM=="block", ENV{ID_SERIAL}=="36 �→ d0946606d79f90025f3e09a0c1fc035", ATTR{queue/scheduler}=" �→ noop" ACTION=="add|change", SUBSYSTEM=="block", ENV{ID_SERIAL}=="36 tidb_version(): Release Version: v5.0.0 Edition: Community Git Commit Hash: 689a6b6439ae7835947fcaccf329a3fc303986cb Git Branch: HEAD UTC Build Time: 2020-05-28 11:09:45 GoVersion: go1.13.4 693 Race Enabled: