Jiayuan Chen 5ad41a38c3 mm: zswap: add per-memcg stat for incompressible pages ... Patch series "mm: zswap: add per-memcg stat for incompressible pages", v3. In containerized environments, knowing which cgroup is contributing incompressible pages to zswap is essential for effective resource management. This series adds a new per-memcg stat 'zswap_incomp' to track incompressible pages, along with a selftest. This patch (of 2): The global zswap_stored_incompressible_pages counter was added in commit dca4437a58 ("mm/zswap: store <PAGE_SIZE compression failed page as-is") to track how many pages are stored in raw (uncompressed) form in zswap. However, in containerized environments, knowing which cgroup is contributing incompressible pages is essential for effective resource management [1]. Add a new memcg stat 'zswap_incomp' to track incompressible pages per cgroup. This helps administrators and orchestrators to: 1. Identify workloads that produce incompressible data (e.g., encrypted data, already-compressed media, random data) and may not benefit from zswap. 2. Make informed decisions about workload placement - moving incompressible workloads to nodes with larger swap backing devices rather than relying on zswap. 3. Debug zswap efficiency issues at the cgroup level without needing to correlate global stats with individual cgroups. While the compression ratio can be estimated from existing stats (zswap / zswapped * PAGE_SIZE), this doesn't distinguish between "uniformly poor compression" and "a few completely incompressible pages mixed with highly compressible ones". The zswap_incomp stat provides direct visibility into the latter case. Link: https://lkml.kernel.org/r/20260213071827.5688-1-jiayuan.chen@linux.dev Link: https://lkml.kernel.org/r/20260213071827.5688-2-jiayuan.chen@linux.dev Link: https://lore.kernel.org/linux-mm/CAF8kJuONDFj4NAksaR4j_WyDbNwNGYLmTe-o76rqU17La=nkOw@mail.gmail.com/ [1] Signed-off-by: Jiayuan Chen <jiayuan.chen@shopee.com> Acked-by: Nhat Pham <nphamcs@gmail.com> Acked-by: Shakeel Butt <shakeel.butt@linux.dev> Reviewed-by: Yosry Ahmed <yosry.ahmed@linux.dev> Reviewed-by: SeongJae Park <sj@kernel.org> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Chengming Zhou <chengming.zhou@linux.dev> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Michal Hocko <mhocko@kernel.org> Cc: Michal Koutný <mkoutny@suse.com> Cc: Muchun Song <muchun.song@linux.dev> Cc: Roman Gushchin <roman.gushchin@linux.dev> Cc: Shuah Khan <shuah@kernel.org> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>		2026-04-05 13:53:00 -07:00
..
acpi	mailbox: platform and core updates	2026-02-14 11:13:32 -08:00
asm-generic	kbuild: Split .modinfo out from ELF_DETAILS	2026-02-26 11:50:19 -07:00
clocksource
crypto	Networking changes for 7.0	2026-02-11 19:31:52 -08:00
cxl
drm	drm/dp: Add definition for Panel Replay full-line granularity	2026-03-04 15:26:08 +02:00
dt-bindings	phy-for-7.0	2026-02-17 11:40:04 -08:00
hyperv	Revert "mshv: expose the scrub partition hypercall"	2026-03-11 16:54:24 +00:00
keys
kunit	kunit: irq: Ensure timer doesn't fire too frequently	2026-02-24 14:44:21 -08:00
kvm
linux	mm: zswap: add per-memcg stat for incompressible pages	2026-04-05 13:53:00 -07:00
math-emu
media	[GIT PULL for v7.0] media updates	2026-02-11 12:20:25 -08:00
memory
misc
net	Just a few updates:	2026-03-18 19:25:41 -07:00
pcmcia
ras
rdma	RDMA/core: Check id_priv->restricted_node_type in cma_listen_on_dev()	2026-02-25 07:50:10 -05:00
rv	rv: Fix multiple definition of __pcpu_unique_da_mon_this	2026-02-20 13:12:00 +01:00
scsi	SCSI misc on 20260212	2026-02-12 15:43:02 -08:00
soc
sound	ASoC: Fixes for v7.0	2026-03-05 17:22:14 +01:00
target
trace	tracing: Revert "tracing: Remove pid in task_rename tracing output"	2026-03-21 16:41:18 -04:00
uapi	ARM:	2026-03-15 12:22:10 -07:00
ufs
vdso
video
xen	xen/xenbus: better handle backend crash	2026-03-04 15:31:40 +01:00
Kbuild