| Message ID | 20240219031911.10372-1-fangzheng.zhang@unisoc.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | Introduce slabinfo version 2.2 | expand |
On 2024/2/19 11:19, Fangzheng Zhang wrote: > Hi all, > > This series introduces slabinfo version 2.2 to users. > In slabinfo V2.2, we added a slabreclaim column to > record whether each slab pool is of reclaim type. > This will be more conducive for users to obtain > the type of each slabdata more intuitively than through > the interface /sys/kernel/slab/$cache/reclaim_account. I want to recommend a better tool: drgn[1] for these tasks, instead of changing the output format of /proc/slabinfo, which may break existing userspace tools. [1] https://drgn.readthedocs.io/en/latest/index.html# > And we have added an example of the output result > executing '> cat proc/slabinfo' in the file > Documentation/filesystems/proc.rst. > > Changes in v2: > - Modify the slabinfo version number to 2.2. > - Add an example of slabinfo output and future works. > > Changes in v1: > - Add a slabreclaim column to record type of each slab > in file proc/slabinfo. > > [1] https://lore.kernel.org/linux-mm/20240131094442.28834-1-fangzheng.zhang@unisoc.com/ > > Fangzheng Zhang (2): > mm/slab: Add slabreclaim flag to slabinfo > Documentation: filesystems: introduce proc/slabinfo to users > > Documentation/filesystems/proc.rst | 33 ++++++++++++++++++++++++++++++ > mm/slab_common.c | 9 ++++---- > 2 files changed, 38 insertions(+), 4 deletions(-) >
On Mon, Feb 19, 2024 at 7:29 PM Chengming Zhou <zhouchengming@bytedance.com> wrote: > > On 2024/2/19 11:19, Fangzheng Zhang wrote: > > Hi all, > > > > This series introduces slabinfo version 2.2 to users. > > In slabinfo V2.2, we added a slabreclaim column to > > record whether each slab pool is of reclaim type. > > This will be more conducive for users to obtain > > the type of each slabdata more intuitively than through > > the interface /sys/kernel/slab/$cache/reclaim_account. > > I want to recommend a better tool: drgn[1] for these tasks, instead of changing > the output format of /proc/slabinfo, which may break existing userspace tools. > > [1] https://drgn.readthedocs.io/en/latest/index.html# > Thank you very much for providing a new way. I have the following three questions about the new tool you provided: ---- 1. From the introduction, the tool is described as an alternative to the crash utility. Will the permission requirements have different effects when used, user or userdebug? ---- 2. The 'Helpers' chapter introduces the simple use of common.memory, but there is no output example. It involves the use of slab objects, but it also needs to provide a specific slab_cache_name, which cannot give an intuitive overall information like proc/slabinfo. I guess it is difficult to achieve direct output of slab type (reclaim or unreclaim). I don’t know, right? ---- 3. Regarding the supported versions, is it supported for both arm/arm64? I don't seem to have seen any similar instructions. Finally, I would like to express my gratitude again. This tool will be very helpful for me in other future work. > > And we have added an example of the output result > > executing '> cat proc/slabinfo' in the file > > Documentation/filesystems/proc.rst. > > > > Changes in v2: > > - Modify the slabinfo version number to 2.2. > > - Add an example of slabinfo output and future works. > > > > Changes in v1: > > - Add a slabreclaim column to record type of each slab > > in file proc/slabinfo. > > > > [1] https://lore.kernel.org/linux-mm/20240131094442.28834-1-fangzheng.zhang@unisoc.com/ > > > > Fangzheng Zhang (2): > > mm/slab: Add slabreclaim flag to slabinfo > > Documentation: filesystems: introduce proc/slabinfo to users > > > > Documentation/filesystems/proc.rst | 33 ++++++++++++++++++++++++++++++ > > mm/slab_common.c | 9 ++++---- > > 2 files changed, 38 insertions(+), 4 deletions(-) > >
On 2024/2/20 14:25, zhang fangzheng wrote: > On Mon, Feb 19, 2024 at 7:29 PM Chengming Zhou > <zhouchengming@bytedance.com> wrote: >> >> On 2024/2/19 11:19, Fangzheng Zhang wrote: >>> Hi all, >>> >>> This series introduces slabinfo version 2.2 to users. >>> In slabinfo V2.2, we added a slabreclaim column to >>> record whether each slab pool is of reclaim type. >>> This will be more conducive for users to obtain >>> the type of each slabdata more intuitively than through >>> the interface /sys/kernel/slab/$cache/reclaim_account. >> >> I want to recommend a better tool: drgn[1] for these tasks, instead of changing >> the output format of /proc/slabinfo, which may break existing userspace tools. >> >> [1] https://drgn.readthedocs.io/en/latest/index.html# >> > > Thank you very much for providing a new way. > I have the following three questions about the new tool you provided: > ---- 1. From the introduction, the tool is described as an alternative > to the crash utility. > Will the permission requirements have different effects when > used, user or userdebug? > ---- 2. The 'Helpers' chapter introduces the simple use of > common.memory, but there is no output example. > It involves the use of slab objects, but it also needs to > provide a specific slab_cache_name, > which cannot give an intuitive overall information like > proc/slabinfo. You can of course use drgn to iterate over all slabs by using the global "slab_caches" list. (All kernel space is at your hand.) > I guess it is difficult to achieve direct output of slab > type (reclaim or unreclaim). I don’t know, right? It's easy for drgn to inspect each slab's information. > ---- 3. Regarding the supported versions, is it supported for both > arm/arm64? I don't seem to have seen any similar instructions. > Finally, I would like to express my gratitude again. This tool will be > very helpful for me in other future work. Please check https://github.com/osandov/drgn for details. Thanks.