linux/include
Eric Dumazet 4890b686f4 net: keep sk->sk_forward_alloc as small as possible
Currently, tcp_memory_allocated can hit tcp_mem[] limits quite fast.

Each TCP socket can forward allocate up to 2 MB of memory, even after
flow became less active.

10,000 sockets can have reserved 20 GB of memory,
and we have no shrinker in place to reclaim that.

Instead of trying to reclaim the extra allocations in some places,
just keep sk->sk_forward_alloc values as small as possible.

This should not impact performance too much now we have per-cpu
reserves: Changes to tcp_memory_allocated should not be too frequent.

For sockets not using SO_RESERVE_MEM:
 - idle sockets (no packets in tx/rx queues) have zero forward alloc.
 - non idle sockets have a forward alloc smaller than one page.

Note:

 - Removal of SK_RECLAIM_CHUNK and SK_RECLAIM_THRESHOLD
   is left to MPTCP maintainers as a follow up.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-06-10 16:21:27 -07:00
..
acpi cxl for 5.19 2022-05-27 21:24:19 -07:00
asm-generic kernel: add platform_has() infrastructure 2022-06-06 08:06:00 +02:00
clocksource pwm: Changes for v5.19-rc1 2022-06-01 10:49:11 -07:00
crypto
drm LoongArch: Add writecombine support for drm 2022-06-03 20:09:27 +08:00
dt-bindings Char / Misc / Other smaller driver subsystem updates for 5.19-rc1 2022-06-03 11:36:34 -07:00
keys KEYS: trusted: Introduce support for NXP CAAM-based trusted keys 2022-05-23 18:47:50 +03:00
kunit kunit: take kunit_assert as const 2022-05-16 13:23:00 -06:00
kvm Merge branch kvm-arm64/per-vcpu-host-pmu-data into kvmarm-master/next 2022-05-16 17:48:36 +01:00
linux Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-06-10 15:55:32 -07:00
math-emu
media media: h264: Sort p/b reflist using frame_num 2022-05-17 10:02:29 +02:00
memory
misc
net net: keep sk->sk_forward_alloc as small as possible 2022-06-10 16:21:27 -07:00
pcmcia
ras
rdma RDMA/core: Fix typo in comment 2022-05-24 11:24:58 -03:00
scsi SCSI misc on 20220524 2022-05-25 19:09:48 -07:00
soc ARM: driver changes for 5.19 2022-05-26 10:32:47 -07:00
sound ARM: multiplatform changes, part 2 2022-06-02 15:23:54 -07:00
target SCSI misc on 20220524 2022-05-25 19:09:48 -07:00
trace Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-06-09 16:38:15 -07:00
uapi Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-06-10 15:55:32 -07:00
ufs scsi: ufs: Split the drivers/scsi/ufs directory 2022-05-19 20:27:37 -04:00
vdso
video video: fbdev: radeon: Fix spelling typo in comment 2022-05-26 13:38:59 +02:00
xen arm/xen: Assign xen-grant DMA ops for xen-grant DMA devices 2022-06-06 16:07:30 +02:00