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From:   trondmy@kernel.org
To:     linux-nfs@vger.kernel.org
Cc:     Neil Brown <neilb@suse.de>
Subject: [PATCH v2 0/9] Crossing our fingers is not a strategy
Date:   Mon, 21 Mar 2022 21:16:09 -0400
Message-Id: <20220322011618.1052288-1-trondmy@kernel.org>
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From: Trond Myklebust <trond.myklebust@hammerspace.com>

We'd like to avoid GFP_NOWAIT whenever possible, because it has no fall-
back reclaim strategy for dealing with a failure of the initial
allocation.
At the same time, memory pools appear to be suboptimal as an allocation
strategy when used with anything other than GFP_NOWAIT, since they cause
threads to hang upon failure.

This patch series therefore aims to demote the mempools to being a
strategy of last resort, with the primary allocation strategy being to
use the underlying slabs.
While we're at it, we want to ensure that rpciod, xprtiod and nfsiod all
use the same allocation strategy, so that the latter two don't thwart
our ability to complete writeback RPC calls by getting blocked in the mm
layer.

Trond Myklebust (9):
  NFS: Fix memory allocation in rpc_malloc()
  NFS: Fix memory allocation in rpc_alloc_task()
  SUNRPC: Fix unx_lookup_cred() allocation
  SUNRPC: Make the rpciod and xprtiod slab allocation modes consistent
  NFS: nfsiod should not block forever in mempool_alloc()
  NFS: Avoid writeback threads getting stuck in mempool_alloc()
  NFSv4/pnfs: Ensure pNFS allocation modes are consistent with nfsiod
  pNFS/flexfiles: Ensure pNFS allocation modes are consistent with
    nfsiod
  pNFS/files: Ensure pNFS allocation modes are consistent with nfsiod

 fs/nfs/filelayout/filelayout.c         |  2 +-
 fs/nfs/flexfilelayout/flexfilelayout.c | 50 +++++++++++---------------
 fs/nfs/internal.h                      |  7 ++++
 fs/nfs/nfs42proc.c                     |  2 +-
 fs/nfs/pagelist.c                      | 10 +++---
 fs/nfs/pnfs.c                          | 39 +++++++++-----------
 fs/nfs/pnfs_nfs.c                      |  8 +++--
 fs/nfs/write.c                         | 34 +++++++++---------
 include/linux/nfs_fs.h                 |  2 +-
 include/linux/sunrpc/sched.h           |  1 +
 net/sunrpc/auth_unix.c                 | 18 +++++-----
 net/sunrpc/backchannel_rqst.c          |  8 ++---
 net/sunrpc/rpcb_clnt.c                 |  4 +--
 net/sunrpc/sched.c                     | 31 ++++++++++------
 net/sunrpc/socklib.c                   |  3 +-
 net/sunrpc/xprt.c                      |  5 +--
 net/sunrpc/xprtsock.c                  | 11 +++---
 17 files changed, 123 insertions(+), 112 deletions(-)

-- 
2.35.1